From: DervishD <raul@pleyades.net>
To: Oliver Kiddle <okiddle@yahoo.co.uk>
Cc: Zsh <zsh-workers@sunsite.dk>
Subject: Re: Can Zsh do this for me?
Date: Tue, 2 Sep 2003 21:21:02 +0200 [thread overview]
Message-ID: <20030902192102.GB94@DervishD> (raw)
In-Reply-To: <2298.1062505554@gmcs3.local>
Hi Oliver :)
* Oliver Kiddle <okiddle@yahoo.co.uk> dixit:
> > Right know, it can be written like this:
> > ps xh | grep name | tr -s " " | cut -d " " -f 2
> This doesn't seem to work for PIDs >= 10000 where there is no initial
> space in the ps listing.
Oh, yes, you're true, it was just a quick hack, not a good work ;))
The point was the four processes neeced for this, and your answer
below. Thanks a lot!!
> > get the process ID using the command name, or if I can write the
> > above pipeline in a shorter form using some Zsh capability.
> You can write the command-line as:
> ${${${(M)${(f)"$(ps xh)"}:#*$name*}## #}%% *}
> (M) and :# does the grep. ## # removes initial space and the %% * does
> the job of cut.
> Use $~name if you'd like to use patterns for name. And if you only want
> one PID, use [1] on the end of it all.
That's great! A very good example of what I was looking for: the
power of Zsh to do things faster ;)))) Right now I don't understand
the entire line (but I'm new to expansions...), but I will take a
look at the manual. Thanks a lot, truly :)
> > BTW, I want to write a 'ps' command on my own because I don't
> > like the procps one available for Linux, nor the others out there,
> > and I think that with the zsh/stat module I could do it in a shell
> > script :)))
> I'm not quite sure how you'd do that using zsh/stat (using /proc?) but
> good luck with it.
The point is to examine /proc. Some of the things can be done
using 'cat' and the like, but a couple of them must be done with the
stat syscall, and maybe zsh/mapfile to read the file contents in an
easy way. Really, Zsh is just incredible :)
Raúl Núñez de Arenas Coronado
--
Linux Registered User 88736
http://www.pleyades.net & http://raul.pleyades.net/
next prev parent reply other threads:[~2003-09-02 19:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-02 12:08 DervishD
2003-09-02 12:25 ` Oliver Kiddle
2003-09-02 19:21 ` DervishD [this message]
2003-09-02 12:38 ` Alexey Tourbin
2003-09-02 13:07 ` Peter Stephenson
2003-09-02 19:22 ` DervishD
2003-09-02 13:30 ` Jason Price
2003-09-02 19:57 ` DervishD
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