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Top Forums Shell Programming and Scripting Hopefully a simple script, bash or perl... Post 302486011 by anurag.singh on Thursday 6th of January 2011 05:13:02 PM
Old 01-06-2011
awk will do this with two pass through the file.
In 1st pass, just store 1st field (FS=: )in array i.e. a[NR]=$1
In 2nd pass, just apply the formula as below: $1=a[FNR+1]-a[FNR]-3
 

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