What do you think pack 'a*', '123456' does? Are you interested in ord? 
#!/usr/bin/perl
use warnings;
use strict;

my $string = '123456';
$string .= "\x1c";  # or chr 0x1c

printf '%02x ', ord $_, ' ' for split //, $string;
print "\n";

[download]
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: concatenate a non-printable character onto an ascii string and inspect the content by choroba
in thread concatenate a non-printable character onto an ascii string and inspect the content by holandes777

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