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 the first set option in the current context:

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

• Check if an option is set in a string (specified option must be the first element of the string):

getopts {{x}} {{opt}} "{{string text}}"; echo ${{opt}}

• Set an option to require an argument and print them:

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