Re: How to run something before invoking the inputted command?

[Clark J. Wang]

On Sat, Jul 10, 2010 at 11:30 AM, Eric Blake <eblake@redhat.com> wrote:

> On 07/09/2010 09:22 PM, Clark J. Wang wrote:
> > For example, in the interactive shell, I want to track the time when
> every
> > inputted command is invoked. So I want to run a `date' command before
> > actually invoking the inputted command. For now I have to do like this:
> >
> > $ date; command1
> > $ date; command2
> >
> > Is there an easy way to do that?
>
> Not quite before the command, but it is very easy to include $(date) as
> part of PS1 to have a timestamp listed in the prompt that is printed
> after every command.


Yes, timestamp in PS1 is fine for after-command purposes. And actually I use
the PROMPT_COMMAND var for that.

Except for long-running processes, there won't
> even be much difference in the timestamps.
>
> Looks like not a perfect solution. :)

>  --
> Eric Blake   eblake@redhat.com    +1-801-349-2682
> Libvirt virtualization library http://libvirt.org
>
>