how to ignore specific argument in bash?

[andrew mcelroy]

Greetings all,

This is probably a dumb questions, but I am writing a basic shell
script that is passing $@ to a command. The issue is I'd like to
filter $@ so that it does not pass a specific flag ( in this case
--xcode-dir) ? How can I drop this in a bash script?

Andrew McElroy

[Jack Coats]

in other languages using substring and index string functions would
make it easy, but bash has few unified shell functions.

csh or ksh might be a better option, but it can be done in bash or sh
with a lot of effort.

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[Greg Donald]

On Sun, Sep 21, 2014 at 4:06 PM, andrew mcelroy <soph...@gmail.com> wrote:

Assuming you want to drop the argument (value) after --xcode-dir as well:

#!/usr/bin/env bash

args=("$@")
myargs=()
nextarg=-1

for ((i=0; i<$#; i++)) {
if [ $nextarg == $i ]; then continue; fi
case ${args[$i]} in
--xcode-dir) nextarg=$((i+1)) ;;
*) myargs+="${args[$i]} "
esac
}

echo $myargs

./remove_xcode --xcode-dir foo --bar baz
--bar baz


--
Greg Donald

[andrew mcelroy]

On Sun, Sep 21, 2014 at 5:14 PM, Greg Donald <gdo...@gmail.com> wrote:
> On Sun, Sep 21, 2014 at 4:06 PM, andrew mcelroy <soph...@gmail.com> wrote:
>> Greetings all,
>>
>> This is probably a dumb questions, but I am writing a basic shell
>> script that is passing $@ to a command. The issue is I'd like to
>> filter $@ so that it does not pass a specific flag ( in this case
>> --xcode-dir) ? How can I drop this in a bash script?
>
> Assuming you want to drop the argument (value) after --xcode-dir as well:
>

This is what I was looking for.
I ended up going with $1 through $7 (since it is going to be the same
input and is automated).

Thanks Greg.
This should be October's "Asleep At The Prompt".

> #!/usr/bin/env bash
>
> args=("$@")
> myargs=()
> nextarg=-1
>
> for ((i=0; i<$#; i++)) {
> if [ $nextarg == $i ]; then continue; fi
> case ${args[$i]} in
> --xcode-dir) nextarg=$((i+1)) ;;
> *) myargs+="${args[$i]} "
> esac
> }
>
> echo $myargs
>
> ./remove_xcode --xcode-dir foo --bar baz
> --bar baz
>
>
> --
> Greg Donald
>

[John F. Eldredge]

I would suggest placing comments, in both the calling script and called
script, that changes to the number of arguments will require editing both
scripts. Otherwise, it would be be easy to overlook the interdependence
during some future edit.