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November 13, 2017 10:50
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| #!/bin/bash | |
| # String with available options (more info: man getopt) | |
| # Colon after argument means that value is required for this argumen | |
| # h -- help | |
| # a -- main args | |
| OPTSTRING="ha:" | |
| VALUE="" | |
| do_work() | |
| { | |
| local arg="$1" | |
| # Do whatever you want | |
| echo "Test: $arg" | |
| exit 1; | |
| } | |
| print_usage() | |
| { | |
| echo "USAGE: $0 [ options ]" | |
| echo "OPTIONS:" | |
| echo " -h Print this message and exit" | |
| echo " -a <val> Option description" | |
| exit "$1" | |
| } | |
| process_options() | |
| { | |
| local options_provided="false" | |
| # Check that we have some arguments | |
| if [[ -z "$@" ]]; then | |
| echo "No options provided!" | |
| print_usage 1 | |
| fi | |
| # Parse incoming options | |
| while getopts "$OPTSTRING" opt; do | |
| shift $((OPTIND-1)) | |
| case $opt in | |
| # Usage flag | |
| h) | |
| print_usage 0 | |
| ;; | |
| # Main value flag | |
| a) | |
| VALUE=$OPTARG | |
| ;; | |
| # Option used without required argument | |
| :) | |
| print_usage 1 | |
| ;; | |
| # Invalid options (optarg manually prints error message) | |
| *) | |
| print_usage 1 | |
| ;; | |
| esac | |
| done | |
| # Check for extra arguments | |
| if [[ -n "$@" ]]; then | |
| echo "Too many arguments!" | |
| print_usage 1 | |
| fi | |
| } | |
| # Process incoming options | |
| process_options "$@" | |
| # Do some wotk | |
| do_work "$VALUE" |
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