611 lines
13 KiB
Plaintext
611 lines
13 KiB
Plaintext
===================================
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Pipelines
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===================================
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whoami | cat
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cat foo | grep -v bar
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---
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(program
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(pipeline
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(command
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name: (command_name (word)))
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(command
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name: (command_name (word))))
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(pipeline
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(command
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name: (command_name (word))
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argument: (word))
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(command
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name: (command_name (word))
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argument: (word)
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argument: (word))))
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===================================
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Lists
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===================================
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a | b && c && d; d e f || e g
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---
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(program
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(list
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(list
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(pipeline
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(command (command_name (word)))
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(command (command_name (word))))
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(command (command_name (word))))
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(command (command_name (word))))
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(list
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(command (command_name (word)) (word) (word))
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(command (command_name (word)) (word))))
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====================================
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While statements
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====================================
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while something happens; do
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echo a
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echo b
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done
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---
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(program
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(while_statement
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condition: (command
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name: (command_name (word))
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argument: (word))
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body: (do_group
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(command name: (command_name (word)) argument: (word))
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(command name: (command_name (word)) argument: (word)))))
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====================================
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Until statements
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====================================
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until something happens; do
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echo a
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echo b
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done
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---
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(program
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(while_statement
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condition: (command
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name: (command_name (word))
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argument: (word))
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body: (do_group
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(command name: (command_name (word)) argument: (word))
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(command name: (command_name (word)) argument: (word)))))
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====================================
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While statements with IO redirects
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====================================
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while read line; do
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echo $line
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done < <(cat file)
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---
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(program
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(redirected_statement
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body: (while_statement
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condition: (command
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name: (command_name (word))
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argument: (word))
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body: (do_group
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(command
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name: (command_name (word))
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argument: (simple_expansion (variable_name)))))
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redirect: (file_redirect
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destination: (process_substitution (command
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name: (command_name (word))
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argument: (word))))))
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====================================
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For statements
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====================================
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for a in 1 2 $(seq 5 10); do
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echo $a
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done
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for ARG; do
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echo $ARG
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ARG=''
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done
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---
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(program
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(for_statement
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variable: (variable_name)
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value: (word)
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value: (word)
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value: (command_substitution (command
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name: (command_name (word))
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argument: (word)
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argument: (word)))
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body: (do_group
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(command
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name: (command_name (word))
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argument: (simple_expansion (variable_name)))))
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(for_statement
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variable: (variable_name)
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body: (do_group
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(command
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name: (command_name (word))
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argument: (simple_expansion (variable_name)))
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(variable_assignment
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name: (variable_name)
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value: (raw_string)))))
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====================================
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Select statements
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====================================
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select choice in X Y $(ls); do
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echo $choice
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break
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done
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select ARG; do
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echo $ARG
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ARG=''
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done
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---
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(program
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(for_statement
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(variable_name)
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(word)
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(word)
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(command_substitution (command (command_name (word))))
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(do_group
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(command
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(command_name (word))
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(simple_expansion (variable_name)))
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(command (command_name (word)))))
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(for_statement
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(variable_name)
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(do_group
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(command
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(command_name (word))
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(simple_expansion (variable_name)))
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(variable_assignment (variable_name) (raw_string)))))
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====================================
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C-style for statements
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====================================
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for (( c=1; c<=5; c++ ))
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do
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echo $c
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done
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for (( c=1; c<=5; c++ )) {
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echo $c
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}
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for (( ; ; ))
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do
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echo 'forever'
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done
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---
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(program
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(c_style_for_statement
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(word)
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(binary_expression (word) (word))
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(word)
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(do_group
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(command (command_name (word)) (simple_expansion (variable_name)))))
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(c_style_for_statement
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(word)
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(binary_expression (word) (word))
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(word)
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(compound_statement
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(command (command_name (word)) (simple_expansion (variable_name)))))
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(c_style_for_statement
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(do_group
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(command (command_name (word)) (raw_string)))))
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====================================
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If statements
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====================================
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if cat some_file | grep -v ok; then
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echo one
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elif cat other_file | grep -v ok; then
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echo two
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else
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exit
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fi
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---
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(program
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(if_statement
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(pipeline
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(command (command_name (word)) (word))
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(command (command_name (word)) (word) (word)))
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(command (command_name (word)) (word))
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(elif_clause
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(pipeline
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(command (command_name (word)) (word))
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(command (command_name (word)) (word) (word)))
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(command (command_name (word)) (word)))
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(else_clause
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(command (command_name (word))))))
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====================================
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If statements with conditional expressions
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====================================
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if [ "$(uname)" == 'Darwin' ]; then
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echo one
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fi
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---
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(program
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(if_statement
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(test_command (binary_expression
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(string (command_substitution (command (command_name (word)))))
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(raw_string)))
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(command (command_name (word)) (word))))
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====================================
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Case statements
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====================================
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case "opt" in
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a)
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echo a
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;;
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b)
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echo b
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;&
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c)
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echo c;;
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esac
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case "$Z" in
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ab*|cd*) ef
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esac
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case $dest in
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*.[1357])
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exit $?
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;;
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esac
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---
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(program
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(case_statement (string)
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(case_item (word)
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(command (command_name (word)) (word)))
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(case_item (word)
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(command (command_name (word)) (word)))
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(case_item (word)
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(command (command_name (word)) (word))))
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(case_statement (string (simple_expansion (variable_name)))
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(case_item (word) (word)
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(command (command_name (word)))))
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(case_statement (simple_expansion (variable_name))
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(case_item (concatenation (word) (word))
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(command (command_name (word)) (simple_expansion (special_variable_name))))))
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=============================
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Test commands
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=============================
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if [[ "$lsb_dist" != 'Ubuntu' || $(ver_to_int "$lsb_release") < $(ver_to_int '14.04') ]]; then
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return 1
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fi
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---
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(program
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(if_statement
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(test_command (binary_expression
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(binary_expression
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(binary_expression
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(string (simple_expansion (variable_name)))
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(raw_string))
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(command_substitution (command
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(command_name (word))
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(string (simple_expansion (variable_name))))))
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(command_substitution (command (command_name (word)) (raw_string)))))
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(command (command_name (word)) (word))))
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=============================
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Test commands with ternary
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=============================
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if (( 1 < 2 ? 1 : 2 )); then
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return 1
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fi
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---
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(program
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(if_statement
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(test_command
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(ternary_expression
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(binary_expression (word) (word))
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(word) (word)))
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(command
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(command_name (word)) (word))))
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=============================
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Test commands with regexes
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=============================
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[[ "35d8b" =~ ^[0-9a-fA-F] ]]
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[[ $CMD =~ (^|;)update_terminal_cwd($|;) ]]
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[[ ! " ${completions[*]} " =~ " $alias_cmd " ]]
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! [[ "$a" =~ ^a|b\ *c|d$ ]]
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[[ "$1" =~ ^${var}${var}*=..* ]]
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[[ "$1" =~ ^\-${var}+ ]]
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[[ ${var1} == *${var2}* ]]
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[[ "$server" =~ [0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} ]]
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[[ "$primary_wins" =~ ([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}) ]]
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---
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(program
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(test_command
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(binary_expression
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(string)
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(regex)))
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(test_command
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(binary_expression
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(simple_expansion (variable_name))
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(regex)))
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(test_command
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(unary_expression
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(binary_expression
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(string (expansion (subscript (variable_name) (word))))
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(string (simple_expansion (variable_name))))))
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(negated_command
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(test_command
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(binary_expression
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(string (simple_expansion (variable_name)))
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(regex))))
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(test_command
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(binary_expression
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(string (simple_expansion (variable_name)))
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(regex)))
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(test_command
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(binary_expression
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(string (simple_expansion (variable_name)))
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(regex)))
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(test_command
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(binary_expression
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(expansion (variable_name))
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(regex)))
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(test_command
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(binary_expression
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(string (simple_expansion (variable_name)))
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(regex)))
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(test_command
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(binary_expression
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(string (simple_expansion (variable_name)))
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(regex))))
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===============================
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Subshells
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===============================
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(
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./start-server --port=80
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) &
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---
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(program
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(subshell (command (command_name (word)) (word))))
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===============================
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Function definitions
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===============================
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do_something() {
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echo ok
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}
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run_subshell_command() (
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true
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)
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run_test_command() [[ -e foo ]]
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function do_something_else() {
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a | xargs -I{} find xml/{} -type f
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}
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function do_yet_another_thing {
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echo ok
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} 2>&1
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---
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(program
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(function_definition
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(word)
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(compound_statement (command (command_name (word)) (word))))
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(function_definition
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(word)
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(subshell (command (command_name (word)))))
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(function_definition
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(word)
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(test_command (unary_expression (test_operator) (word))))
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(function_definition
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(word)
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(compound_statement
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(pipeline
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(command (command_name (word)))
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(command
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(command_name (word))
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(concatenation (word))
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(word)
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(concatenation (word))
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(word)
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(word)))))
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(redirected_statement (function_definition
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(word)
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(compound_statement (command (command_name (word)) (word))))
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(file_redirect (file_descriptor) (word))))
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=========================================
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Variable declaration: declare & typeset
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=========================================
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declare var1
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typeset -i -r var2=42 var3=10
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---
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(program
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(declaration_command (variable_name))
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(declaration_command (word) (word)
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(variable_assignment (variable_name) (word))
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(variable_assignment (variable_name) (word))))
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=========================================
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Variable declaration: readonly
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=========================================
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readonly var1
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readonly var2=42
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---
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(program
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(declaration_command (variable_name))
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(declaration_command (variable_assignment (variable_name) (word))))
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=========================================
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Variable declaration: local
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=========================================
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local a=42 b
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local -r c
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---
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(program
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(declaration_command
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(variable_assignment (variable_name) (word))
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(variable_name))
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(declaration_command
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(word)
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(variable_name)))
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=========================================
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Variable declaration: export
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=========================================
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export PATH
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export FOOBAR PATH="$PATH:/usr/foobar/bin"
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---
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(program
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(declaration_command (variable_name))
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(declaration_command
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(variable_name)
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(variable_assignment (variable_name) (string (simple_expansion (variable_name))))))
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===========================================================
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Variable declaration: command substitution with semi-colon
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===========================================================
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_path=$(
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while statement; do
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cd ".."
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done;
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echo $PWD
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)
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---
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(program
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(variable_assignment (variable_name)
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(command_substitution
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(while_statement
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(command (command_name (word)))
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(do_group (command (command_name (word)) (string))))
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(command (command_name (word)) (simple_expansion (variable_name))))))
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===========================================
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Expressions passed to declaration commands
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===========================================
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export "$(echo ${key} | tr [:lower:] [:upper:])=${p_key#*=}"
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---
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(program
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(declaration_command
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(string
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(command_substitution
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(pipeline
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(command (command_name (word)) (expansion (variable_name)))
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(command (command_name (word)) (concatenation (word)) (concatenation (word)))))
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(expansion (variable_name) (word)))))
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=========================================
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Unset commands
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=========================================
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unset A
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unset "$variable_name"
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unsetenv -f ONE TWO
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---
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(program
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(unset_command (variable_name))
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(unset_command (string (simple_expansion (variable_name))))
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(unset_command (word) (variable_name) (variable_name)))
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===========================================
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Compound statements
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===========================================
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a () {
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ls || { echo "b"; return 0; }
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echo c
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}
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{ echo "a"
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echo "b"
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} >&2
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---
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(program
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(function_definition (word) (compound_statement
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(list
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(command (command_name (word)))
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(compound_statement
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(command (command_name (word)) (string))
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(command (command_name (word)) (word))))
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(command (command_name (word)) (word))))
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(redirected_statement
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(compound_statement (command (command_name (word)) (string)) (command (command_name (word)) (string)))
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(file_redirect (word))))
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