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base network adress calculation

> echo '192.168.12.43/27' | perl -pe '($_,$m)=split"/";$m*=-1;$a="";map{if(($m+=8)>0){$a.=$_>>$m<<$m}else{$a.=$_}$a.="."}split"\\.";$_=$a'
> 192.168.12.32

just so I don't forget :)

posted on Thursday, March 31, 2011
Labels: perl

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