Or you could split, but it's probably not as efficient: 

#!/usr/bin/perl 
use strict;
use warnings;

my $file = $ARGV[0];
my @line;

open (my $input, "<", $file) || die "$file not available\n\n";
while (<$input>)
    {
        if ($_ =~ /^>/)
            {
                @line = split (/\|/, $_);
                print STDOUT "$line[0]\n"; 
            }
        else
            {
                print STDOUT "$_";
            }
    }

[download]

In reply to Re: trim header lines in files by mtmcc
in thread trim header lines in files by utpalmtbi

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.