Use and capture of the "time" command

[Tyler Aviss]

Yup. Looks like bash has a built-in but somewhat different version of
"time" built-in. Thanks for catching it, I thought I was crazy!

On Mon, Nov 15, 2010 at 2:25 PM, Vic Gedris <vic-2vUEnoANFF8dnm+yROfE0A at public.gmane.org> wrote:
>
> I believe that when  you run the "time" command within bash, it's running a
> built-in command.  It looks like that messes with the redirection for some
> reason (maybe someone else can explain it?).
>
> If you run:
> /usr/bin/time dd....
> You will probably get something more like you expect.
>
> -Vic
>
> Vic Gedris - http://vic.gedris.org
> Toronto, Ontario, Canada - http://www.junctiontriangle.ca
>
>
>
> On Mon, Nov 15, 2010 at 5:18 PM, Tyler Aviss <tjaviss-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> 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?
>> --
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>
>



-- 
Tyler Aviss
Systems Support
LPIC/LPIC-2/DCTS/CLA

“It can takes months to gain a customer, but only seconds to lose one"
--
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TLUG requests: Linux topics, No HTML, wrap text below 80 columns
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