On 19May2012 08:27, Michael Torrie <torr...@gmail.com> wrote:
| On 05/16/2012 08:16 PM, Rita wrote:
| > I currently build a lot of interfaces/wrappers to other applications
| > using bash/shell. One short coming for it is it lacks a good method
| > to handle arguments so I switched to python a while ago to use
| > 'argparse' module.
|
| Actually there is a great way of parsing command line options in
| bash, using the GNU "getopt" program. See:
| http://www.manpagez.com/man/1/getopt/
|
| This command is available on all Linux systems, and most BSD systems.
| There's also freegetopt, a BSD implementation for unix, MSDOS, or Windows.
And if you don't want to do option bundling it's easy enough to write a
simple option parser without getopt at all.
My standard option parsing looks somewhat like this:
# some things to control via the options
the_file=
doit=1
trace=
# badness?
badopts=
while [ $# -gt 0 ]
do
case $1 in
-f) the_file=$2; shift ;;
-n) doit= ;;
-x) trace=1 ;;
--) shift; break ;;
-?*) echo "$0: unrecognised option: $1" >&2
badopts=1
;;
*) break ;;
esac
shift
done
# ... parse non-option arguments ...
[ $badopts ] && { echo "$usage" >&2; exit 2; }
# ... rest of program ...
There's nothing hard there.
Cheers,
--
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http://www.cskk.ezoshosting.com/cs/
Any profit should go to Arnie's `get the daemon carved on Mount Rushmore' fund.
- Marty Albini, DOD0550, mar...@sdd.hp.com
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