Adding and Subtracting Variables

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Adding and Subtracting Variables

Original Message

Name: Big_Z
Date: May 19, 2004 at 10:40:39 Pacific
Subject: Adding and Subtracting Variables
OS: AIX 5.1
CPU/Ram: 1

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

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Response Number 1

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

Reply: (edit)

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

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Response Number 2

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

Reply: (edit)

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

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