#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11144847
use warnings;

my %res;
/(id\d+)(.*)/s and push @{ $res{$2} }, $1 for split />/, join '', <DAT
+A>;
for ( sort keys %res )
  {
  local $" = '|';
  print ">@{$res{$_}}$_";
  }

__DATA__
>id1|Q51487|P-474-4|86-98,113-126,297-310,322-335
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALE
>id2|Q51487|P-474-4|86-98,113-126,297-310,322-335
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALE
>id3|Q51487|P-474-4|86-98,113-126,297-310,322-335
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALE
>id4|Q51487|P-474-4|86-98,113-126,297-310,322-335 alt
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALE
>id5|Q51487|P-474-4|86-98,113-126,297-310,322-335 alt
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALE

[download]

Outputs: 

>id1|id2|id3|Q51487|P-474-4|86-98,113-126,297-310,322-335
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALE
>id4|id5|Q51487|P-474-4|86-98,113-126,297-310,322-335 alt
CSLIPDYQRPEAPVAAAYPQGQAYGQNTGAAAVPAADIGWREFFRDPQLQQLIGVALEc>

[download]

In reply to Re: How do I use the map command for this? by tybalt89
in thread How do I use the map command for this? by Anonymous Monk

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