Re: default/simple globbing

[#!microsuxx]

2 step default globbing

On Thu, Nov 28, 2024, 9:04 AM lacsaP Patatetom <patatetom@gmail.com> wrote:

> 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.
>