1116d Variable formatting - beyond printf? - Perl Programming
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Variable formatting - beyond printf?

Posted by enquirer (enquirer), 22 November 2002
I am a perl newbie trying to format a  variable. The variable  is in the form of 00112233aa11 . I want to format this number to look like 00:11:22:33:aa:11 and I am having trouble doing that. I tried using sprintf function to no avail.  Any help is greatle appreciated.

Posted by admin (Graham Ellis), 22 November 2002
Code:
#!/usr/bin/perl

$var = "00112233aa11";
@parts = unpack("a2" x 6,$var);
print join ":",@parts;


Explanation - you can't do it with printf directly, as you need to separate out the various elements of your incoming string into separate variables.  Use unpack or substr to do this.  Then you can rejoing them using join, as you're always using the same separator character.  You could use printf once you have unpacked into separate scalars, but that would make for a slightly longer solution.


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