tldr/pages/common/getopts.md

getopts

Parse shell options from arguments. This command does not support longform options and thus using getopt is recommended instead. More information: https://www.gnu.org/software/bash/manual/bash.html#index-getopts.

• Check if an option is set:

getopts {{x}} {{opt}}; echo $opt

• Set an option to require an argument and check said argument:

getopts {{x}}: {{opt}}; echo $OPTARG

• Check for multiple options:

while getopts {{xyz}} {{opt}}; do case $opt in x) echo x is set;; y) echo y is set;; z) echo z is set;; esac; done

• Set getopts to silent mode and handle option errors:

while getopts :{{x:}} {{opt}}; do case $opt in x) ;; :) echo "Argument required";; ?) echo "Invalid argument" esac;; done

• Reset getopts:

OPTIND=1