Try this:

#! perl -slw
use strict;
use Data::Dump qw[ pp ];

my( @ordered, %grouped );

while( <DATA> ) {
    chomp;
    my @pair = split ',', $_;
    $ordered[ @ordered ] = $pair[ 0 ] unless exists $grouped{ $pair[ 0
+ ] };
    push @{ $grouped{ $pair[0] } }, $pair[1];
}
#pp \@ordered, \%grouped;

print "$_|", join ',', @{ $grouped{ $_ } } for @ordered;



__DATA__
20055111,YOUSLAV,
20055111,YURT,
20055111,TENWIMPL,
20011271,YOUSLAV,
20011271,WUMARTHE
20011541,YOUSLAV,
20011541,TENWIMPL,
20102741,WEDLOFOU,
20102741,YOUSLAV,
20102741,YURT,
20102741,KUPLYSO,
20102741,TENWIMPL,
20155505,YOUSLAV,
20155505,YURT,
20155505,TENWIMPL,
20147155,YOUSLAV,
20147155,KUPLYSO,
20147155,FRIMA,

[download]
Output:
C:\test>1215831.pl
20055111|YOUSLAV,YURT,TENWIMPL
20011271|YOUSLAV,WUMARTHE
20011541|YOUSLAV,TENWIMPL
20102741|WEDLOFOU,YOUSLAV,YURT,KUPLYSO,TENWIMPL
20155505|YOUSLAV,YURT,TENWIMPL
20147155|YOUSLAV,KUPLYSO,FRIMA

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority". The enemy of (IT) success is complexity.
In the absence of evidence, opinion is indistinguishable from prejudice. Suck that fhit

In reply to Re: How do I remove duplicate numeric elements of an array and preserve alphabetic elements? by BrowserUk
in thread How do I remove duplicate numeric elements of an array and preserve alphabetic elements? by jzelkowsz

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