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PORegarding perl unpack
 

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    <p>I am planning to use unpack in the file. First i tested with a string. When i have a embedded space in a string the below script is showing it as null. When i tested with a file space is getting read properly. Not sure why it's changing it to null when i do with string. Can i use unpack while reading a fixed length file? Do i need to consider trailing space or anything else?</p> <pre><code>#!/usr/local/bin/perl use strict; use warnings; my $str="hek kaaa"; print "&lt;$str&gt;\n"; foreach(unpack("(A1)*", $str)) { print sprintf("%x", ord), " "; } Output: &lt;hek kaaa&gt; 68 65 6b 0 6b 61 61 61 </code></pre> <p>Thanks a lot for the response. Pasted my query below </p> <p>When the perl program reads from a text file and unpacks using the format "A" is working properly. First line i have a embedded space in the first field between A and D. LABEL Variable gets printed as "A D3". But when i had a variable $str="A D3" and unpacked the below way it's having a null after A. How is it working differently when reading from a file and variable? </p> <pre><code>foreach(unpack("(A1)*", $str)) { print sprintf("%x", ord), " "; } </code></pre> <p>it displays as the hex output as 41 0 44 33</p> <pre><code>cat test.txt A D37845566974923342XYZ24023984 QRW49327408234028434ERD24448009 my $file = 'test.txt'; open(my $data, '&lt;', $file) or die "Could not open '$file'\n"; while (my $line = &lt;$data&gt;) { print $line; chomp $line; my ($label, $source, $dest, $type, $value) = unpack ("A4 A8 A8 A4 A8", $line); print "LABEL: $label SOURCE: $source DEST: $dest TYPE: $type VALUE: $value\n"; print "length of a string:" . length($line) . "\n"; foreach(unpack("(a1)*", $label)) { print sprintf("%x", ord), " "; } print "\n"; } </code></pre>
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    1. COWhat are you really trying to accomplish? It looks like you're going about it in a really awkward way.
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