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Diffstat (limited to '')
-rw-r--r-- | misc-utils/getopt-example.bash | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/misc-utils/getopt-example.bash b/misc-utils/getopt-example.bash new file mode 100644 index 0000000..0870882 --- /dev/null +++ b/misc-utils/getopt-example.bash @@ -0,0 +1,75 @@ +#!/bin/bash + +# A small example script for using the getopt(1) program. +# This script will only work with bash(1). +# A similar script using the tcsh(1) language can be found +# as getopt-example.tcsh. + +# Example input and output (from the bash prompt): +# +# ./getopt-example.bash -a par1 'another arg' --c-long 'wow!*\?' -cmore -b " very long " +# Option a +# Option c, no argument +# Option c, argument 'more' +# Option b, argument ' very long ' +# Remaining arguments: +# --> 'par1' +# --> 'another arg' +# --> 'wow!*\?' + +# Note that we use "$@" to let each command-line parameter expand to a +# separate word. The quotes around "$@" are essential! +# We need TEMP as the 'eval set --' would nuke the return value of getopt. +TEMP=$(getopt -o 'ab:c::' --long 'a-long,b-long:,c-long::' -n 'example.bash' -- "$@") + +if [ $? -ne 0 ]; then + echo 'Terminating...' >&2 + exit 1 +fi + +# Note the quotes around "$TEMP": they are essential! +eval set -- "$TEMP" +unset TEMP + +while true; do + case "$1" in + '-a'|'--a-long') + echo 'Option a' + shift + continue + ;; + '-b'|'--b-long') + echo "Option b, argument '$2'" + shift 2 + continue + ;; + '-c'|'--c-long') + # c has an optional argument. As we are in quoted mode, + # an empty parameter will be generated if its optional + # argument is not found. + case "$2" in + '') + echo 'Option c, no argument' + ;; + *) + echo "Option c, argument '$2'" + ;; + esac + shift 2 + continue + ;; + '--') + shift + break + ;; + *) + echo 'Internal error!' >&2 + exit 1 + ;; + esac +done + +echo 'Remaining arguments:' +for arg; do + echo "--> '$arg'" +done |