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#!/bin/bash
# UseGetOpt.sh
# Author: Peggy Russell <prusselltechgroup@gmail.com>
UseGetOpt () {
declare inputOptions
declare -r E_OPTERR=85
declare -r ScriptName=${0##*/}
declare -r ShortOpts="adf:hlt"
declare -r LongOpts="aoption,debug,file:,help,log,test"
DoSomething () {
echo "The function name is '${FUNCNAME}'"
# Recall that $FUNCNAME is an internal variable
#+ holding the name of the function it is in.
}
inputOptions=$(getopt -o "${ShortOpts}" --long \
"${LongOpts}" --name "${ScriptName}" -- "${@}")
if [[ ($? -ne 0) || ($# -eq 0) ]]; then
echo "Usage: ${ScriptName} [-dhlt] {OPTION...}"
exit $E_OPTERR
fi
eval set -- "${inputOptions}"
# Only for educational purposes. Can be removed.
#-----------------------------------------------
echo "++ Test: Number of arguments: [$#]"
echo '++ Test: Looping through "$@"'
for a in "$@"; do
echo " ++ [$a]"
done
#-----------------------------------------------
while true; do
case "${1}" in
--aoption | -a) # Argument found.
echo "Option [$1]"
;;
--debug | -d) # Enable informational messages.
echo "Option [$1] Debugging enabled"
;;
--file | -f) # Check for optional argument.
case "$2" in #+ Double colon is optional argument.
"") # Not there.
echo "Option [$1] Use default"
shift
;;
*) # Got it
echo "Option [$1] Using input [$2]"
shift
;;
esac
DoSomething
;;
--log | -l) # Enable Logging.
echo "Option [$1] Logging enabled"
;;
--test | -t) # Enable testing.
echo "Option [$1] Testing enabled"
;;
--help | -h)
echo "Option [$1] Display help"
break
;;
--) # Done! $# is argument number for "--", $@ is "--"
echo "Option [$1] Dash Dash"
break
;;
*)
echo "Major internal error!"
exit 8
;;
esac
echo "Number of arguments: [$#]"
shift
done
shift
# Only for educational purposes. Can be removed.
#----------------------------------------------------------------------
echo "++ Test: Number of arguments after \"--\" is [$#] They are: [$@]"
echo '++ Test: Looping through "$@"'
for a in "$@"; do
echo " ++ [$a]"
done
#----------------------------------------------------------------------
}
################################### M A I N ########################
# If you remove "function UseGetOpt () {" and corresponding "}",
#+ you can uncomment the "exit 0" line below, and invoke this script
#+ with the various options from the command-line.
#-------------------------------------------------------------------
# exit 0
echo "Test 1"
UseGetOpt -f myfile one "two three" four
echo;echo "Test 2"
UseGetOpt -h
echo;echo "Test 3 - Short Options"
UseGetOpt -adltf myfile anotherfile
echo;echo "Test 4 - Long Options"
UseGetOpt --aoption --debug --log --test --file myfile anotherfile
exit
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