[.hacks.]
Shell Scripts
It is sometimes quite challenging to try to squeeze a lot out of a limited programming environment. I was faced with the problem to convert an ip-address to hex-digits in a bourne-shell script. Instead of using external commands, I tried to use built in functionality only. The result is a set of useful shell functions for converting numbers between hex-, decimal- and binary-format as well as some for simple math resp. logical operations.
For speed reasons I tried to avoid backticks operators for assignments and made heavy use of the eval command. As a result no fork() is necessary for any of the functions.
If you have improvements, fixes or additions feel free to contact me.
Have fun.
[.math.sh.]