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Editing: getopt-parse.bash

#!/bin/bash

# A small example program for using the new getopt(1) program.
# This program will only work with bash(1)
# An similar program using the tcsh(1) script language can be found
# as parse.tcsh

# Example input and output (from the bash prompt):
# ./parse.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 [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

while true ; do
	case "$1" in
		-a|--a-long) echo "Option a" ; shift ;;
		-b|--b-long) echo "Option b, argument \`$2'" ; shift 2 ;;
		-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"; shift 2 ;;
				*)  echo "Option c, argument \`$2'" ; shift 2 ;;
			esac ;;
		--) shift ; break ;;
		*) echo "Internal error!" ; exit 1 ;;
	esac
done
echo "Remaining arguments:"
for arg do echo '--> '"\`$arg'" ; done

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