Multiple arithmetic operations in a single line


 
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# 1  
Old 03-16-2013
Multiple arithmetic operations in a single line

hi,

I want to do multiple arithmetic operations in a single line. I tried with the following line

Code:
total_size=`expr ($total_size + $file_size) / 1024`

this line is throwing me error.

Im working on korn shell. Can i know how to do multiple arithmetic operations in a single line
# 2  
Old 03-16-2013
With a recent Korn shell (newer than 1988):
Code:
total_size=$(( (total_size + file_size) / 1024 ))

if you want integer arithmetic or:
Code:
total_size=$(( (total_size + file_size) / 1024. ))

if you want floating point arithmetic.
This User Gave Thanks to Don Cragun For This Post:
# 3  
Old 03-16-2013
Code:
expr \( $total_size + $file_size \) / 1024

Parentheses are special for the shell. So, you need to escape them.
Also note the whitespace introduced between the parenthesis (both opening and closing) and the following/preceding token.
And beware, expr can only do integer arithmetic.

Hence, I would recommend using the arithmetic capabilities of the shell ($((...))) itself (if you have them, that is) instead of an external expr command.

Last edited by elixir_sinari; 03-16-2013 at 12:23 AM..
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