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Full Discussion: How To Calculate
Top Forums Shell Programming and Scripting How To Calculate Post 302299657 by dharol on Friday 20th of March 2009 05:13:01 PM
Old 03-20-2009
Subtraction with Two Variables in CSH

I know there are many similar questions but have not been able to find a syntax in the posts that work.

I calculate var1 and var2 in a previous portion of the script. Then i want to set var3 to var2-var1.
Have tried all kinds of variations on:

var3 = `"expr $var2 - $var1`

I'm unfortunately not exactly a unix newbie, just not a natural Smilie

thanks for any help.

-dharol
 

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ENVSTORE(1)						    BSD General Commands Manual 					       ENVSTORE(1)

NAME
envstore -- save and restore environment variables SYNOPSIS
envstore command [args ...] DESCRIPTION
envstore can save and restore environment variables, thus transferring them between different shells. command must be one of clear Forget all stored variables eval Produce shell code for evaluation, restoring all saved variables list List saved variables in better readable format save variable [value] Save variable either with its current shell value or with value rm variable Remove variable from store Note: Only the first character of command is checked, so envstore e instead of envstore eval, envstore c for envstore clear, etc., are also valid. ENVIRONMENT
ENVSTORE_FILE The file in which the environment parameters are stored, /tmp/envstore-EUID by default, LIMITATIONS
Variable names or values must not contain null bytes or newlines. Due to limitations imposed by most shells, it is not possible to save parameters containing more than one consecutive whitespace. envstore will save and display them correctly, but unless you do IFS trickery, your shell will not be able to load them. The current maximum length (in bytes) is 255 bytes for the variable name and 1023 bytes for its content. AUTHOR
envstore was written by Daniel Friesel <derf@derf.homelinux.org>. Original idea and script by Maximilian Gass <mxey@ghosthacking.net>. SEE ALSO
envify(1) BSD
December 1, 2009 BSD
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