Re: why fail , [[ $sep$*$sep == $sep--$sep ]]

[alex xmb sw ratchev]

On Sat, Feb 17, 2024, 16:14 Greg Wooledge <greg@wooledge.org> wrote:

> On Sat, Feb 17, 2024 at 04:07:22PM +0100, alex xmb sw ratchev wrote:
> > set aa bb cc -- dd ; f=$'\1' IFS=$f ; [[ $f$*$f == "$f--$f" ]] && echo ye
> >
> > it says no ye
>
> Why would you think $* and -- would be equivalent, when you've got 5
> positional parameters?
>

i used the old logic , sep sep-item-list sep matching sep data sep

the -- is for arg sep , cat1.. -- cat2 -- cat3 ( or cat1 cat2 cat3 )
it was for testing possible coding ways

unicorn:~$ set aa bb cc -- dd
> unicorn:~$ f=$'\1' IFS=$f
> unicorn:~$ printf %s "$*" | hd
> 00000000  61 61 01 62 62 01 63 63  01 2d 2d 01 64 64
> |aa.bb.cc.--.dd|
> 0000000e
> unicorn:~$ printf %s "$f$*$f" | hd
> 00000000  01 61 61 01 62 62 01 63  63 01 2d 2d 01 64 64 01
> |.aa.bb.cc.--.dd.|
> 00000010
> unicorn:~$ printf %s "$f--$f" | hd
> 00000000  01 2d 2d 01                                       |.--.|
> 00000004
>

i think in ur example would been 012d2d01
if 2d is -

>