Re: default/simple globbing

[lacsaP Patatetom]

Le mer. 27 nov. 2024 à 17:22, Andreas Kähäri <andreas.kahari@abc.se> a
écrit :

> On Wed, Nov 27, 2024 at 02:41:45PM +0100, lacsaP Patatetom wrote:
> > Le mer. 27 nov. 2024 à 14:01, #!microsuxx <fxmbsw7@gmail.com> a écrit :
> >
> > > .. not spaces safe , but dev sys name usually doesnt have spaces
> > >
> > > On Wed, Nov 27, 2024, 1:58 PM #!microsuxx <fxmbsw7@gmail.com> wrote:
> > >
> > >> ls
> > >> 2-3  2-3.1  2-3:1.0  usb2
> > >> ~/tt $ a=( *-* ) a=( ${a[@]/*[:.]*} ) ; declare -p a
> > >> declare -a a=([0]="2-3")
> > >>
> > >> On Wed, Nov 27, 2024, 12:56 PM lacsaP Patatetom <patatetom@gmail.com>
> > >> wrote:
> > >>
> > >>> hi,
> > >>>
> > >>> I try to display only part of the `/sys/bus/usb/devices/` folder
> with `ls
> > >>> /sys/bus/usb/devices/*-*[!.:]*` or `ls
> /sys/bus/usb/devices/*-*[^.:]*`
> > >>> but
> > >>> it doesn't subtract entries with a dot or colon in their name (only
> usb
> > >>> entries are removed).
> > >>>
> > >>> if it's possible, what is the correct expression to use without
> having to
> > >>> activate extended globbing ?
> > >>>
> > >>> regards, lacsaP.
> > >>>
> > >>> $ ls /sys/bus/usb/devices/
> > >>> ...
> > >>> /sys/bus/usb/devices/2-3
> > >>> /sys/bus/usb/devices/2-3.1
> > >>> /sys/bus/usb/devices/2-3:1.0
> > >>> /sys/bus/usb/devices/usb2
> > >>> ...
> > >>>
> > >>> $ ls /sys/bus/usb/devices/*-*[!.:]*
> > >>> ...
> > >>> /sys/bus/usb/devices/2-3
> > >>> /sys/bus/usb/devices/2-3.1
> > >>> /sys/bus/usb/devices/2-3:1.0
> > >>> ...
> > >>>
> > >>
> > this isn't quite what I want : with `ls` I'd like to list only those
> > entries that match the regular expression
> > `^/sys/bus/usb/devices/[0-9]+-[0-9]+$', but the bash expression
> > `/sys/bus/usb/devices/*-*[!.:]*` used with `ls` doesn't return the
> desired
> > entries.
> > although the expression seems correct, it may not be possible with bash's
> > default globbing...
> >
> > I use the `ls` command to address globbing, but in reality, the
> expression
> > should take place in a `for` loop to replace this one which works as
> > expected :
> >
> > $ for usb in $(find /sys/bus/usb/devices/ | grep -E '/[0-9]+-[0-9]+$');
> do
> > echo $usb; etc...; done
> > /sys/bus/usb/devices/2-3
> > /sys/bus/usb/devices/1-10
> > /sys/bus/usb/devices/4-1
> > /sys/bus/usb/devices/1-8
> > /sys/bus/usb/devices/1-2
> >
> > when this one doesn't work :
> >
> > for usb in /sys/bus/usb/devices/*-*[!.:]*; do echo $usb; done
> > /sys/bus/usb/devices/1-0:1.0
> > /sys/bus/usb/devices/1-10
> > /sys/bus/usb/devices/1-10:1.0
> > /sys/bus/usb/devices/1-10:1.1
> > ...
> > /sys/bus/usb/devices/4-1.4
> > /sys/bus/usb/devices/4-1.4:1.0
> > /sys/bus/usb/devices/4-1:1.0
> >
> > the goal is to use only `bash` and abandon `find` and `grep` (`find` can
> do
> > this on its own).
>
> It seems to me that using an extended globbing pattern would be the
> natural thing to do in this case, or you would not be using bash and
> instead do it in POSIX sh.
>
>         shopt -s extglob nullglob
>         for dev in /dev/usb/devices/*-!(*[.:]*)
>         do
>                 : stuff
>         done
>
> If you're afraid to turn on the extglob option globally, you may
> localise it to a subshell.
>
>         ( shopt -s extglob nullglob
>         for ...as above...
>         done )
>
> Anything else would just be inconvenient and awkward.
>
> --
> Andreas (Kusalananda) Kähäri
> Uppsala, Sweden
>
> .
>

ok, so not possible with default globbing.
thank you all for your feedback.

regards, lacsaP.