Re: Linux measuring elapsed time for a shell command

From: Alan Connor (zzzzzz_at_xxx.yyy)
Date: 05/11/04 

Date: Tue, 11 May 2004 19:09:07 GMT

On 11 May 2004 08:27:08 -0700, Peter Grossi <google@grossi.co.uk> wrote:
>
>
> Hi
>
> I am trying to measure the elapsed time for execution of a shell
> command under RedHat 9.0
>
> By putting "time" at the start of the command line, the command is
> executed and the time statistics are reported on screen.
>
> E.g. time dir
>
> The problem is that I need the time statistics to be redirected to a
> file or to a pipe. I have tried various things, but while I can get
> the command output to a file or pipe the time statistics will only go
> to the terminal screen.
>
> Can anybody help?
>
> Thanks
>
> Peter Grossi

Got a workaround, since the bash builtin doesn't seem to have the option
to re-direct the output to a file:

$ script outputfile

$ time command &> /dev/null

$ time command &> /dev/null

Ctrl-d

(to end the script session)

Now the output of everything that went to your terminal is in outputfile,
with what you want and some stuff that you don't :-) The -a option to script
will append-to rather than overwrite outputfile for successive script sessions.

The normal output of the commands are sent to /dev/null to keep
the outputfile as clean as possible.

outputfile can have any name at all, default is "typescript" if
you don't specify a file.

AC 

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