24 lines
1.1 KiB
Bash
24 lines
1.1 KiB
Bash
# Parse command line options
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# =========================================================================== #
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# This is an example script for using both long and short flags without using getopt (which is nonstandard)
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# Copy paste from
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# https://stackoverflow.com/questions/402377/using-getopts-to-process-long-and-short-command-line-options
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die() { echo "$*" >&2; exit 2; } # complain to STDERR and exit with error
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needs_arg() { if [ -z "$OPTARG" ]; then die "No arg for --$OPT option"; fi; }
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while getopts ab:c-: OPT; do
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if [ "$OPT" = "-" ]; then # long option: reformulate OPT and OPTARG
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OPT="${OPTARG%%=*}" # extract long option name
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OPTARG="${OPTARG#$OPT}" # extract long option argument (may be empty)
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OPTARG="${OPTARG#=}" # if long option argument, remove assigning `=`
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fi
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case "$OPT" in
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a | alpha ) ALPHA=true ;;
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b | bravo ) needs_arg; BRAVO="$OPTARG" ;;
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c | charlie ) CHARLIE=true ;;
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??* ) die "Illegal option --$OPT" ;; # bad long option
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\? ) exit 2 ;; # bad short option (error reported via getopts)
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esac
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done
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shift $((OPTIND-1)) # remove parsed options and args from $@ list |