This is a draft cheat sheet. It is a work in progress and is not finished yet.
Introduction
This is a quick reference to getting started with Bash scripting. |
Learn bash in y minutes (learnxinyminutes.com) |
Bash Guide (mywiki.wooledge.org) |
Bash Hackers Wiki (wiki.bash-hackers.org) |
String quotes
name="John"
echo "Hi $name" #=> Hi John
echo 'Hi $name' #=> Hi $name
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Shell execution
echo "I'm in $(pwd)"
echo "I'm in pwd
" # obsolescent
# Same
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Functions
get_name() {
echo "John"
}
echo "You are $(get_name)"
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Strict mode
set -euo pipefail
IFS=$'\n\t'
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Example
#!/usr/bin/env bash
name="John"
echo "Hello $name!"
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Variables
name="John"
echo $name # see below
echo "$name"
echo "${name}!"
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Generally quote your variables unless they contain wildcards to expand or command fragments.
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