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Adding and Subtracting Variables

Comment:

Hello, I have a script in which I need to subtract the value of one variable from another. Here is an example of what I am doing: Total=$(grep -c XXXX filename.txt) TotalA=$(grep -c -E "AA|BB" filename.txt) TotalB= ???? I want to set the variable TotalB to subtract TotalA from Total. Each variable will be a number.. Do I also need to define as integer? Thanks for any help on this. Big Z

Name: thepubba
Date: May 19, 2004 at 12:26:59 Pacific

Reply:

As long as you are not doing floating point, this should work: (( TotalB = (Total - TotalA) ))

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Name: Dlonra
Date: May 19, 2004 at 18:39:10 Pacific

Reply:

TotalB=$(($Total - $TotalA)) # bash or TotalB=$(( $(grep -c XXXX filename.txt) - $(grep -c -E "AA|BB" filename.txt) ))

0

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