obscure_shell_syntax_schumatize_draft2.md

Obscure Shell Syntax

(this layout might be better: https://github.com/dylanaraps/pure-sh-bible?tab=readme-ov-file#default-value ) 2025-03-15: improve on this: https://gist.github.com/ClementNerma/1dd94cb0f1884b9c20d1ba0037bdcde2

• !:0
• !:1
• !:1-3
• !:1-
• !#1

• !$
• !^
• !*
• !#

• !!
• !!:p
• !!:s/foo/bar/
• !!:gs/foo/bar/

• !ls
• !ls:3

• $PWD
• ${PWD}
• ${PWD:gs/Users/home/}
• ${PWD:s/Users/home/}
• "${PWD:/$HOME/~/}"
• ${PWD:3:5}

• ${FILE:-/tmp/in.txt}
• ${FILE:=/tmp/in.txt}

• ${1:"fallback_value"}
• ${1:-"fallback_value"}
• ${1:+"value_if_set"}
• ${1:?"missing argument. Exiting."}

• $@
• $1
• $2
• $_

• $?
• $$
• $!

• ""
• $""
• $''

• ${PWD:l}
• ${PWD:u}
• ${PWD:t}
• ${PWD:r}
• ${PWD:t:u}

What the end result will look like (think about if this is what you really want: https://learnxinyminutes.com/vimscript/ )