Aug 31

[C++] Measuring entropy of file / partition

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You can get further information about entropy here.
Here is code of my program entropy.cpp: Read More

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Aug 30

[Bash] How to show information about dd progress / statistics

Bash bash, dd, kill, script

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dd is a great tool for low-level copying and conversion of raw data. It can be also used for data erasure. Unfortunately, it doesn’t show any information about progress of copying.
Here is my little, but useful script:

#!/bin/bash 
# dd.sh Author: Wojtek Jamrozy (www.wojtekrj.net)
 
dd $* & pid=$!
sleep 10
 
while [ -e "/proc/$pid" ] ; do
	kill -USR1 $pid 
	sleep 10
done

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Aug 29

[Perl] How to check divisibility by 3 using regular expressions

Perl Perl, perl 5.10, regular expressions

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Here is a Perl regular expression using Perl 5.10 extensions (this is a finite state automaton):

^(?&s)(?(DEFINE)
 (?<s>([0369](?&z)|[147](?&j)|[258](?&d)))
 (?<z>($|[0369](?&z)|[147](?&j)|[258](?&d)))
 (?<j>([0369](?&j)|[147](?&d)|[258](?&z)))
 (?<d>([0369](?&d)|[147](?&z)|[258](?&j))))
 
</d></j></z></s>