One approach is to grab the number, stuff all lines into a hash, then print the sorted lines. I made many assumptions about your input and output. 
use warnings;
use strict;

my %lines;
while (<DATA>) {
    my ($num) = $_ =~ /(\d+)$/;
    $lines{$num} = $_;
}
for (sort {$a <=> $b} keys %lines) {
    print $lines{$_};
}

__DATA__
foo bar 4
goo 1
hoo boo boo 2
yeah 3

[download]

Outputs: 

goo 1
hoo boo boo 2
yeah 3
foo bar 4

[download]

In reply to Re: Print to specific line by toolic
in thread Print to specific line by perlUser345

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