Re: Determination of file lists from selected folders without returning directory names

[Kaz Kylheku (Coreutils)]

On 17.07.2017 12:37, SF Markus Elfring wrote:
> > > A corresponding result could be achieved by using a subshell (which I 
> > > would
> > > like to avoid for this use case) for a command like “(cd ${my_dir} && 
> > > ls *txt)”.
> >
> > If you want to capture these strings into a variable, you can't really
> > avoid a sub-process.
>
> I looked at a programming interface like the function “opendir”.
> I imagine that there are more advanced possibilities to improve the 
> software
> run time characteristics for this use case.

Well, if it has to be fast, perhaps don't write the code in the shell 
language.

Even an interpreted scripting language that can do string handling 
without
resorting to fork()-based command substitution will beat the shell at 
many
tasks.

> > it can be done like this:
> >
> >    for name in dir/*txt ; do
> >      echo ${name#dir/}
> >    done
>
> I would like to avoid such an operation “Remove matching prefix
> pattern” generally.
> If the desired file lists contain only basenames, extra prefixes do not 
> need
> to be deleted.

I.e. we can use the basename function:

  for name in dir/*txt; do
    basename "$name"
  done

prints the basenames of the matching files, one per line.