Shells
BASH: Bourn Again SHell
${var::-3} also doesnt work on ZSH. Use ${var:0:-3} instead
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chop on variable
echo ${a#gg} (2)
echo ${a%.*} (3)
echo ${var:3} (4)
echo ${var::-2} (5)| 1 | ${…} expand everything inside |
| 2 | # chop gg from the beginning of variable a |
| 3 | % chop gg from the end of variable a |
| 4 | : chop 3 chars from the beginning of variable a |
| 5 | :: chop from the end. |
| 6 | Can use regex inside {} like .*, ??? |
${var::-2} only works with bash v4+. Use ${var::${#var}-2} for older bash
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ZSH
- How to unset things in zsh?
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unset unhash unalias unlimit unsetopt unfunction z unset -f z #bash compliant
- How to write Completions?
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https://github.com/zsh-users/zsh-completions/blob/master/zsh-completions-howto.org
Shell Scripting
${…} tells the shell to expand whatever is inside it
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- How to keymap a script to zle?
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https://unix.stackexchange.com/questions/79897/how-can-i-use-bindkey-to-run-a-script
- How to make a keybinging with ZSH?
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https://stackoverflow.com/questions/18042685/list-of-zsh-bindkey-commands https://jdhao.github.io/2019/06/13/zsh_bind_keys/
- Interactive cli scripts?
- Bash scripting frameworks?
- Awesome shell?
- What is the difference between
…and$(…)? -
Command Substitution
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older vs newer syntax
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man bash
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- Parameter Expansion
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bash days=(sun mon tue wed thu fri sat) echo ${days[3]} echo ${days[-2]} echo ${days[+3]} echo ${days[@]}