If your data exists in a file as a single line of unsigned integers, then you need to extract these integers (digit groups) from the line to a list or array, perhaps after chomp-ing the line (although that may not be necessary if the line is just digits and whitespace with a newline at the end), and then numerically sort the list/array using the  <=> comparator.

c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my $line = '2 3 3 3 5 7 8 12 32 44 55 12 3 23 43 33 1 4 25 43 42 1';
 dd $line;
 ;;
 my @raw_numbers = $line =~ m{ \d+ }xmsg;
 ;;
 my @sorted_numbers = sort { $a <=> $b } @raw_numbers;
 dd \@sorted_numbers;
"
"2 3 3 3 5 7 8 12 32 44 55 12 3 23 43 33 1 4 25 43 42 1"

[1, 1, 2, 3, 3, 3, 3, 4, 5, 7, 8, 12, 12, 23, 25, 32, 33, 42, 43, 43, 
+44, 55]
[download]

But again, what is your input data really like? You can see this with something like Data::Dumper::Dumper(), which should be available in any Perl installation, or Data::Dump::dd(), which I like, or even with individual print statements.

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