Re: Loop with files coming through sorted by name

[Daniel Mills]

On Sat, Oct 16, 2021 at 1:43 PM tolugboji <tolugboji@protonmail.com> wrote:

> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>
> On Saturday, October 16th, 2021 at 5:32 PM, Daniel Mills <
> danielmills1@gmail.com> wrote:
>
> > On Sat, Oct 16, 2021 at 12:17 PM tolugboji tolugboji@protonmail.com
> wrote:
> >
> > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > >
> > > On Saturday, October 16th, 2021 at 1:31 PM, Greg Wooledge <
> > >
> > > greg@wooledge.org> wrote:
> > >
> > > > On Fri, Oct 15, 2021 at 08:31:04PM -0700, Seth David Schoen wrote:
> > > >
> > > > > You can thus do
> > > > >
> > > > > readarray -d "" myarray < <$(find . -type f -print0 | sort -zn)
> > > > >
> > > > > for i in "${myarray[@]}"; do
> > > > >
> > > > > arbitrary shell stuff with "$i"
> > > > > ===============================
> > > > >
> > > > > done
> > > >
> > > > You've got an extraneous $ in there. It's <(find...) not <$(find...).
> > >
> > > In general, files are described by
> > >
> > > ${fnam}-NUM.png
> > >
> > > Would it be possible to sort the files by number if I have the
> situation
> > >
> > > schimmel-1.png
> > >
> > > schimmel-2.png
> > >
> > > ...
> > >
> > > schimmel-13.png
> > >
> > > The number of png files could be in the thousands.
> >
> > find ... -print0 | sort -zt '-' -k 2,2n | while IFS= read -rd '' file; do
> >
> > ...
>
> Almost there except that there could be a number of '-' separators in the
> filename such as
>
> 2021-schimmel-title-1.png
> 2021-schimmel-title-2.png
> ...
> 2021-schimmel-title-356.png
>
> and the sorting would always occur on the last field.
>

Ok, so count the fields and figure out which one you need? Grab one
filename, count the "-"s in it, and use that in a variable. files=(*.png);
tmp=${files[0]//[!-]}; field=$((${#tmp}+1)); printf '%s\0' "${files[@]}" |
sort -zt '-' -k "$field"n | while IFS= read -rd '' file; do ... Or just
0-pad all your numbering so a basic lexographic sort handles all of this
automatically and you can just use a glob.

>
> Additionally I would also like to handle situations like this one
>
> 2021-schimmel-title-001.png
> 2021-schimmel-title-002.png
> ...
> 2021-schimmel-title-356.png
>
>
The numeric sort will handle this already.