"How do I use the map command for this?"
No idea. :-)
"I am pretty sure I need to use the map command"
Why?
In the code below, I simplified the data so that it's easier to see what's happening.
I've also jumbled it up to demonstrate the two sorts — you may not need or want either of these
(biological data can be huge, so don't do any sorting unless it's absolutely necessary).
#!/usr/bin/env perl
use strict;
use warnings;
my %res;
{
local $/ = "\n>";
while (my $record = <DATA>) {
chomp $record;
$record = substr $record, 1 if $. == 1;
$record =~ s/\s*\z//m;
my ($id, $anno_seq) = split /\|/, $record, 2;
push @{$res{$anno_seq}}, $id;
}
}
print '>', join('|', (sort @{$res{$_}}), $_), "\n"
for sort { $res{$a}[0] cmp $res{$b}[0] } keys %res;
__DATA__
>id7|anno2
GHI
>id1|anno1
ABC
>id6|anno1
ABC
>id4|anno2
GHI
>id2|anno3
DEF
>id3|anno1
ABC
>id5|anno1
ABC
Output:
>id1|id3|id5|id6|anno1
ABC
>id2|anno3
DEF
>id4|id7|anno2
GHI
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