My 2˘: perl -E 'say scalar map {1..$_} map {int (rand(50)+1)} (1..5);'

Update:

I guess i'll never learn it to read specs right.

Did you mean this?

1. Pick up 5 random numbers from 1 to 50
2. Add them
3. Print the sum on one line
4. Repeat this 5 times

If so, this should work: perl -E 'say scalar map {1..$_} map {int (rand(50)+1)} (1..5)  for 1..5'

Update 2:

If you want to use the numbers only once, this should work:

#!/usr/bin/env perl

use strict;
use warnings;
use feature qw (say);

my @n = ( 1 .. 50 );

# ad libitum:
# open( my $urandom, "</dev/urandom" ) or die $!;
# read( $urandom, $_, 4 );
# close $urandom;

# srand( unpack( "L", $_ ) );

# for ( my $i = @n ; --$i ; ) {
#     my $j = int( rand( $i + 1 ) );
#     next if $i == $j;
#     @n[ $i, $j ] = @n[ $j, $i ];
# }

say scalar map { 1 .. $_ }
  map { splice( @n, int( rand(@n) ), 1 ) } ( 1 .. 5 )
  for 1 .. 5;

__END__
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To be honest: i didn't test it very thoroughly ;-(

Best regards, Karl