Doing arithmetic on elapsed times


 
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# 1  
Old 05-28-2012
Doing arithmetic on elapsed times

I've written a script that displays the elapsed time of two commands.
Code:
/usr/bin/time -f "%E" gcc -o foo foo.c
/usr/bin/time -f "%E" tcc -o foo foo.c

The output looks something like this:
Code:
5.19
0.27

How can I modify this script to display the difference of these two times? In the above case, I'd want to see 4.92.

Last edited by Franklin52; 05-29-2012 at 03:23 AM.. Reason: Please use code tags
# 2  
Old 05-28-2012
What units are the mentioned times in? Hr.Min or Min.Sec or Sec.Millisec or Millisec.Microsec ???
# 3  
Old 05-29-2012
Here's some actual output.

0:04.85

It's minutes:seconds

where seconds has two decimal digit precision

If you read the man time page you're told the %E means

E Elapsed real (wall clock) time used by the process, in
[hours:]minutes:seconds.

Hope this helps. Thanks.
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