Re: "canonical" approach to writing wrapper scripts

2006-01-24, 06:19(-06), Timothy Larson:
[...]
>> So you can use getopts with that VLc:vt:rlw:xRCsS to parse the
>> command line options.
>
> This is GREAT info, thanks! Can I modify $@ before sending it to the
> program I'm wrapping? The point of my wrapper is to process one extra
> argument, but I'll need to remove it from the arg list before I execute
> the program.
[...]

Yes, you can use "set" and "shift" to modify "$@".

For instance, to insert at the begginning:

set -- "$additional_argument" "$@"

at the end:

set -- "$@" "$additional_argument"

to remove the first 3 arguments:

shift 3

It may be more tricky to insert in the middle or to remove at
the end.

To remove the last one, you can do for instance:

cmdline='set --'

i=1; while [ "$i" -lt "$#" ]; do
cmdline="$cmdline \"\${$i}\""
i=$(($i + 1))
done

eval "$cmdline"

Note that you can sometimes make use of the fact that functions
have a "$@" of their own which may help if you want to make
temporary modifications to "$@" (calling myfunc "$@" allows
myfunc to do things on its own copy of "$@").
--
Stéphane
.

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