even using sort directly works too (i tried it)

How? 

use strict;
use warnings;

my @array=("ch1","ch11","ch2","ch5","ch55","ch16"); 
print join(' ', sort @array), "\n";
__END__
ch1 ch11 ch16 ch2 ch5 ch55

[download]

That's not the same order as Selvakumar wants.

In reply to Re^3: sorting an array by moritz
in thread sorting an array by Selvakumar

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