parse long input parameters

Shell Programming and Scripting
1

anybody know a nice way to parse long input parameters such as --path /dir1/dir2/ (see below). Now I have more than 10 input parameters and it's confusing having parameters like -q something, I would prefer longer ones

case $OPTKEY in
    --path)   M_PATH=$OPTARG          ;;
    -s)   S_PATH=$OPTARG                ;;
done

I am using cygwin and it seems getopt is not available (only getopts)
cheers

2

hi, extract from http://fvue.nl/wiki/Bash\_and_Windows

3

thanks a lot

4

Hi ,

it has been a while since I have tried to parse command line arguments
made of both short and long options. There are many ways to do so but
not as many of them handle switch clustering in a flawlessly way. Here
is a snippet of code that illustrates my point. It is, however, far from
being straightforward (getopts is) since it requires to do the parsing
by hand. At last, the sample uses builtins commands only so the parsing
is expected to be optimal.

 
get_arg () {
    case "${#ARGSTR}" in
	0) test -n "$1" && logger "$1" && return 0 || { logger "--> -${OPTSTR} argument ?" >&2; return 1; } ;;
	*) logger "$ARGSTR"; return 2;;
    esac
}

At parsing time, OPTARG holds the last expected option argument.

 
while :; do 
    case "$#" in 0) break; esac; OPTSTR="$1" 
    case "$OPTSTR" in --) break   ;; 
             --flag_1) OPTSTR=-f1 ;;
             --flag_2) OPTSTR=-f2 ;;
             --flag_3) OPTSTR=-f3 ;;
           --optarg_1) OPTSTR=-o1 ;;
           --optarg_2) OPTSTR=-o2 ;;
    esac 
    case "$OPTSTR" in 
           -*) OPTSTR="${OPTSTR#-}"
               while :; do 
                     case "${#OPTSTR}" in 0) break; esac 
                     ARGSTR="${OPTSTR#?}"; OPTSTR="${OPTSTR%${ARGSTR}}"
                     case "$OPTSTR" in 
                                 o1) OPTARG="$(get_arg "$2")" && shift; case "$?" in 1) exit 65; esac 
                                     logger "-o1/--optarg_1 argument  is $OPTARG";;
                                 o2) OPTARG="$(get_arg "$2")" && shift; case "$?" in 1) exit 65; esac
                                     logger "-o2/--optarg_2 argument  is $OPTARG";;
                                 f1) logger "FLAG_1 is set";;  
                                 f2) logger "FLAG_2 is set";;
                                 f3) logger "FLAG_3 is set";;
                                  *) logger "--> unrecognized option -${OPTSTR}" >&2 && exit 65 ;; 
                     esac 
                     case "$OPTSTR" in o1*|o2*) break; esac
                     OPTSTR="$ARGSTR"
               done 
    esac 
    shift 
done