Use and capture of the "time" command

Chris F.A. Johnson chris-E7bvbYbpR6jSUeElwK9/Pw at public.gmane.org
Mon Nov 15 22:33:44 UTC 2010


On Mon, 15 Nov 2010, Tyler Aviss wrote:

> I'm  trying to time some commands and dump the output to a running
> log. For some reason unknown to me, the time command always seems to
> spit directly to my terminal, even when I'm redirecting stdout and
> stderr.
>
> Anyone know what's going on. For example, this should be dumping to a
> file, not my screen like...
>
>
> root at linux: ~# time dd if=/dev/zero bs=1k count=5000 > /tmp/foo.txt 2>&1
>
> real	0m0.037s
> user	0m0.000s
> sys	0m0.040s
>
> Perhaps I'm just short of caffeine and doing something incredibly
> dumb, but it doesn't seem right
>
> I checked the man-page and it says any arguments after the command
> following "time" are considered arguments of said command, so I
> thought perhaps it was interpreting it like
>
> time $( dd if=/dev/zero bs=1k count=5000 > /tmp/foo.txt 2>&1 )
>
> In that case, I should have be able to override using...
>
> echo $( time dd if=/dev/zero bs=1k count=5000 > /tmp/foo.txt 2>&1 )
>
>
> But I get the same thing. output to the screen and nada in /tmp/foo.txt
> Anyone know what's up with this?

x=$( (( time cd ../../../cfajohnson.com/amorasutol/image ) 2>&1) )

-- 
    Chris F.A. Johnson, <http://cfajohnson.com>
    Author:
    Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
    Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
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