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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Filepath column data: basename
Date: Sat, 21 Nov 2020 10:35:52 +0100
Organization: solani.org
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Am 21.11.2020 um 01:18 schrieb Sarat Sreepathi:
> Hello:
> 
> I have a data file where one of the columns contains full path names. Is there a trick to getting a basename from that field? Any builtins for other transformations on that field?
> 
> Appreciate any pointers.
> Thanks,
> Sarat.
> 

Recursion: ;)

basen(fullp) = (a = strstrt(fullp,'\'), a == 0 ? fullp : basen( 
substr(fullp,a+1,strlen(fullp) ) ) )

pr basen('helo')
pr basen('helo\halo')
pr basen('helo\halo\holo')

In the same way you can delete (possibly multiple) .extensions from 
the filename.