GNU bug report logs - #10915
8.13: df -- overly long output lines are very hard to read

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From: Pádraig Brady <P <at> draigBrady.com>
To: "Voelker, Bernhard" <bernhard.voelker <at> siemens-enterprise.com>
Cc: "10915 <at> debbugs.gnu.org" <10915 <at> debbugs.gnu.org>, Jim Meyering <jim <at> meyering.net>, jaalto <jari.aalto <at> cante.net>
Subject: bug#10915: 8.13: df -- overly long output lines are very hard to read
Date: Thu, 26 Jul 2012 15:23:46 +0100

On 03/01/2012 10:56 AM, Voelker, Bernhard wrote:
> Jim Meyering wrote:
>> jaalto wrote:
> 
>> | >         -r, --reverse
>> | >
>> | >     $ df -Hlr
>> | >
>> | >     Size  Used Avail Use% Mounted-on Filesystem
>> | >     6.0G  4.1G  1.7G  72% /             rootfs
>> | >     192M     0  192M   0% /dev          udev
>> | >      40M  1.5M   38M   4% /run          tmpfs
>> | >     6.0G  4.1G  1.7G  72% /             /dev/disk/by-uuid/492764a5-7506-4489-8fd0-82d0d284d627
>> | >     5.3M     0  5.3M   0% /run/lock     tmpfs
>> | >      79M  7.9M   71M  10% /tmp          tmpfs
>> | >      79M     0   79M   0% /run/shm      tmpfs
>> | >     6.0G  4.1G  1.7G  72% /srv/cante.src /dev/disk/by-uuid/492764a5-7506-4489-8fd0-82d0d284d627
>> | >     6.0G  4.1G  1.7G  72% /srv/cante.tmp /dev/disk/by-uuid/492764a5-7506-4489-8fd0-82d0d284d627
>> | >      18G  8.1G  8.3G  50% /mnt/extent   /dev/sdb1
>> | >      18G  8.1G  8.3G  50% /usr/src      /dev/sdb1
>> | >      18G  8.1G  8.3G  50% /root/vc      /dev/sdb1
> 
>> I agree that your --reverse (but without the short-named '-r') would
>> be a useful improvement, regardless.  That sounds reasonable for 8.16
>> is someone writes the patch.  Even without the -r, you could still
>> abbreviate the long name to "--r".
> 
> What about a more general --fmt (or --format) option to
> just get the columns you want in the order you want?
> E.g.
> 
>   df --format=size,free%,mnt,fs
> or
>   df --format=size-h,mnt  # <column name>-h or 
>   df --format=Size,mnt    # uppercase Size meaning -h

This is a border line feature, but I'm 60:40 for implementing it.

Note something similar I noticed is:

  findmnt -l -o FSTYPE,SOURCE,TARGET

It would make sense to align as closely to that as possible.
So a full --output list supported by df could be
FSTYPE,SOURCE,TARGET,SIZE,USED,AVAIL,FREEPCT

It's probably sufficient to use this to just order fields,
and leave other formatting to existing modifiers.

cheers,
Pádraig.

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