Bash scripting cheat sheet

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Bash scripting cheat sheet

Cheat sheets for various stuff View the Project on GitHub bertvv/cheat-sheets An attempt to bring order in good advice on writing Bash scripts I collected from several sources. General The principles of Clean Code apply to Bash as well Always use long parameter notation when available. This makes the script more readable, especially for lesser known/used commands that you don't remember all the options for. # Avoid: rm -rf -- "${dir}" # Good: rm --recursive --force -- "${dir}" Don't use: but pushd and popd may also be useful: pushd "${foo}" [...] popd Use nohup foo | cat & if foo must be started from a terminal and run in the background. Variables Prefer local variables within functions over global variables If you need global variables, make them readonly Variables should always be referred to in the ${var} form (as opposed to $var. Variables should always be quoted, especially if their value may contain a whitespace or separator character: "${var}" Capitalization: Environment (exported) variables: ${ALL_CAPS} Local variables: ${lower_case} Positional parameters of the script should be checked, those of functions should not Some loops happen in subprocesses, so don't be surprised when setting variabless does nothing after them. Use stdout and greping to communicate status. Always use $(cmd) for command substitution (as opposed to backquotes) Prepend a command with \ to override alias/builtin lookup. E.g.: $ \time bash -c "dnf list installed | wc -l" 5466 1.32user 0.12system 0:01.45elapsed 99%CPU (0avgtext+0avgdata 97596maxresident)k 0inputs+136outputs (0major+37743minor)pagefaults 0swaps Output and redirection For various reasons, printf is preferable to echo. printf gives more control over the output, it's more portable and its behaviour is defined better. Print error messages on stderr. E.g., I use the following function: error() { printf "${red}!!! %s${reset}\" "${*}" 1>&2 } Name heredoc tags with what they're part of, like: cat $TMP_CRON_FILE echo "@reboot /bin/bash /path/to/bash/script.sh" >> $TMP_CRON_FILE crontab $TMP_CRON_FILE rm $TMP_CRON_FILE References Last updated: 22nd August 2020 First published: 16th August 2018 bash shell scripting cheat sheet. bash shell scripting cheat sheet pdf

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