From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-users@zsh.org
Subject: Re: less with subprocess
Date: Fri, 1 Oct 2021 04:47:56 +0200 [thread overview]
Message-ID: <20211001024756.GA1767186@zira.vinc17.org> (raw)
In-Reply-To: <20210930234612.GA21179@gmx.de>
On 2021-10-01 00:46:12 +0100, Dominik Vogt wrote:
> On Thu, Sep 30, 2021 at 10:59:25PM +0200, Pier Paolo Grassi wrote:
> > writing on disk it can eat away all the space I have on my device and make
> > other processes that need that disk space to fail. Even if disk is cheap
> > doesn't mean it's always plentifully available
>
> If you don't want to consume disk space you could use a
> ramdisk/tmpfs for the temporary files.
which can be worse (RAM is often more limited than disk space).
> Less will gobble up memory anyway if it gets tons of input, unless
> you give it the -b or -B option.)
No, not if one doesn't read data past some line.
For instance, I often pipe the output of "svn log" to "less", and
I generally read only the beginning to some point (not known in
advance). So, in practice, "less" will take a few dozens of KB
and avoid useless network transfers (since the log typically
comes from a remote server).
I think I've also run "less" on infinite loops ("while true; ...").
> On the other hand I wonder what kind of command would generate an
> awful lot of output quickly which can still be overlooked manually
> in less. I mean, if you're only interested in the first N lines
> or M bytes, you can pipe the command's output through "head -n N"
> or "head -c M".
But with a pipe, "less" does that for you, automatically, and you
don't have to guess N or M. That's much better!
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
next prev parent reply other threads:[~2021-10-01 2:48 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-27 20:30 Pier Paolo Grassi
2021-09-27 20:46 ` Roman Perepelitsa
2021-09-27 21:38 ` Bart Schaefer
2021-09-27 21:48 ` Bart Schaefer
2021-09-27 22:57 ` Pier Paolo Grassi
2021-09-27 23:05 ` Bart Schaefer
2021-09-27 23:28 ` Pier Paolo Grassi
2021-09-27 23:31 ` Dominik Vogt
2021-09-28 0:41 ` Bart Schaefer
2021-09-28 0:53 ` Bart Schaefer
2021-09-28 18:52 ` Dominik Vogt
2021-09-28 19:29 ` Bart Schaefer
2021-09-29 13:02 ` Vincent Lefevre
2021-09-29 13:13 ` Pier Paolo Grassi
2021-09-29 13:26 ` Vincent Lefevre
2021-09-29 14:14 ` Bart Schaefer
2021-09-29 14:47 ` Pier Paolo Grassi
2021-09-29 17:56 ` Bart Schaefer
2021-09-30 19:22 ` Vincent Lefevre
2021-10-01 16:44 ` Bart Schaefer
2021-10-03 1:45 ` Vincent Lefevre
2021-10-03 21:41 ` Bart Schaefer
2021-09-30 19:17 ` Vincent Lefevre
2021-09-30 19:48 ` Dominik Vogt
2021-09-30 20:59 ` Pier Paolo Grassi
2021-09-30 21:03 ` Pier Paolo Grassi
2021-09-30 22:39 ` Bart Schaefer
2021-09-30 22:46 ` Pier Paolo Grassi
2021-09-30 23:46 ` Dominik Vogt
2021-10-01 0:04 ` Pier Paolo Grassi
2021-10-01 0:06 ` Pier Paolo Grassi
2021-10-01 0:31 ` Dominik Vogt
2021-10-01 1:32 ` Pier Paolo Grassi
2021-10-01 0:17 ` Dominik Vogt
2021-10-01 2:47 ` Vincent Lefevre [this message]
2021-09-29 12:51 ` Vincent Lefevre
2021-09-28 19:50 ` Pier Paolo Grassi
2021-09-27 21:38 ` Dominik Vogt
2021-09-27 22:35 ` Dominik Vogt
2021-09-27 23:03 ` Bart Schaefer
2021-09-29 12:24 ` Vincent Lefevre
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