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how to convert string to an integer and how to do calculations like add.,sub.,mult. on it

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Top Forums Shell Programming and Scripting how to convert string to an integer and how to do calculations like add.,sub.,mult. on it
# 1  
Old 02-22-2011
how to convert string to an integer and how to do calculations like add.,sub.,mult. on it
How to convert string into an integer or number
For example :
Code:
% set tim = `date`
% echo $tim
Tue Feb 22 16:25:08 IST 2011

here How to increment time by 10 hrs

like 16+10 , here 16 is a string in date cmd. .. how to convert 16 to an integer and added to a another nimber ?

Thanks in advance
krishna chaitanya

Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks.
Last edited by zaxxon; 02-22-2011 at 07:51 AM.. Reason: code tags
# 2  
Old 02-22-2011
date -d '10 hours'
# 3  
Old 02-22-2011
my question is too generic way
see ,, long running jobs are there
i need to check how much time that job run
so how can i convert the string to integer and make evaluation

Thanks
krishna chaitanya
# 4  
Old 02-22-2011
As a rule, you would use $hour for a numeric value vice ${hour} for text.

Code:
# hour=`date +%H`
# echo $hour
10

# hour_plus_10=$(($hour + 10))
# echo $hour_plus_10
20

To use the string version:

# echo "What is your ${hour}-${hour_plus_10}?"
What is your 10-20?

Last edited by mfsteve; 02-22-2011 at 11:09 AM.. Reason: Additional info
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