Re: Question on $@ vs $@$@

[Chet Ramey]

On 8/13/24 8:45 PM, Steffen Nurpmeso wrote:
> Hello.
>
> I include bug-bash even though i think bash is correct, but there
> lots of people of expertise are listening, so, thus.
> Sorry for cross-posting, nonetheless.
> Given this snippet (twox() without argument it is)
>
>    one() { echo "$# 1<$1>"; }
>    two() { one "$@"; }
>    twox() { one "$@$@"; }
>    two
>    two x
>    twox
>    twox x
>
> i get
>
>    $ dash shbug.sh
>    0 1<>
>    1 1<x>
>    1 1<>
>    1 1<xx>
>
>    #?0|kent:tmp$ busybox.static sh shbug.sh
>    0 1<>
>    1 1<x>
>    1 1<>
>    1 1<xx>
>
>    #?0|kent:tmp$ bash shbug.sh
>    0 1<>
>    1 1<x>
>    0 1<>
>    1 1<xx>

When, as in this case, the result would be split if the double quotes
weren't there, $@ within double quotes expands to nothing if there are
no positional parameters, no matter how many times it appears.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

OpenPGP_signature.asc
Description: OpenPGP digital signature