Re: PE with BASH_SOURCE doesnt seem to work

[Lawrence Velázquez]

On Wed, Feb 21, 2024, at 1:49 AM, alex xmb sw ratchev wrote:
> i like do shorts , so i tried
> the point is ' prepend PWD to BASH_SOURCE when it doesnt begin with a slash
> '
> but it doesnt seem working
>
> shopt -s extglob
> f=${BASH_SOURCE/#!(/)*/$PWD/&}
> declare -p f
>
> ~ $ bash tbash1
> declare -- f="tbash1"
>
> ~ $ bash "$PWD/"tbash1
> declare -- f="/data/data/com.termux/files/home/tbash1"
>
> the ' bash tbash1 ' case it is , it doesnt prepend anything
> ( i also tried [!/] instead !(/) , same result )

Bash uses the second unquoted "/" (or third, if you're using the
// form) to separate the pattern and the replacement string.  To
use "/" in the pattern itself, escape it.

        $ cat tbash1
        shopt -s extglob

        f=${BASH_SOURCE/#!(\/)*/$PWD/&}
        g=${BASH_SOURCE/#[!\/]/$PWD/&}

        declare -p f g

        $ ./bash tbash1
        declare -- f="/tmp/tbash1"
        declare -- g="/tmp/tbash1"

You should also quote $PWD in the replacement string, just in case
it contains a "&".

        g=${BASH_SOURCE/#[!\/]/"$PWD"/&}

-- 
vq