On Mon, Jun 26, 2000 at 04:13:18PM -0500, [EMAIL PROTECTED] wrote:
> the script is a shell script (#!/bin/sh) which I want to invoke as follows:
>
> appinstall -s <src path> [-t <trg path>] [-softlinks]
This violates POSIX and GNU standards. You want to replace -softlinks
with either a proper short-form option (say "-L") or a proper long-form
option (say "--softlinks").
> my problem is figuring out how to tell from a shell script if the user
> specified -s, -t, and -softlinks, and how to retrieve their associated
> values. I think awk or sed, or both, help me achieve this, but I have never
> used either one.
Wrong tool. The right tool is "getopt"
I'll include a sample script that shows how this could be done.
--- snip snip ----------------------------------------------------------------
#!/bin/sh
USAGE="usage: $0 -s <src path> [-t <trg path>] [-L]"
if set -- `getopt 's:t:L' $@` ; then
: getopt worked
else
echo $USAGE >&2
exit 1
fi
src_path=
trg_path=
softlinks=0
while : ; do
case "$1" in
-s) src_path="$2" ; shift 2 ;;
-t) trg_path="$2" ; shift 2 ;;
-L) softlinks=1 ; shift ;;
--) shift ; break ;;
*) echo $USAGE >&2 ; exit 1 ;;
esac
done
if [ $# -ne 0 ] ; then
echo "$0: unknown parameter \"$1\"" >&2
echo $USAGE >&2
exit 1
fi
if [ "X$src_path" = "X" ] ; then
echo "$0: source path not specified" >&2
echo $USAGE >&2
exit 1
fi
echo "src_path=$src_path"
echo "trg_path=$trg_path"
echo "softlinks=$softlinks"
--- snip snip ----------------------------------------------------------------
--
Chip Rosenthal <[EMAIL PROTECTED]> http://www.unicom.com/
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