bug#7042: df --help does not show `-m' option (original) (raw)

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From: Eric Blake
Subject: bug#7042: df --help does not show `-m' option
Date: Thu, 16 Sep 2010 12:21:39 -0600
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On 09/16/2010 09:20 AM, Pádraig Brady wrote:

On 16/09/10 12:59, Petr Pisar wrote:

Hello,

I found df' utility from coreutils-8.5 does not describe -m' option that is mentioned in info page and the program accepts it.

-- Petr

-m was deprecated in 2001 http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=d1772031

It is not mentioned in the info page as far as I can see It's not specified by POSIX It's not used in solaris It is used in FreeBSD

Oh - I only tested MirBSD (which is more like OpenBSD).

So this is much the same argument as supporting dd bs=1m http://lists.gnu.org/archive/html/coreutils/2010-09/msg00028.html

Also there was a previous request for df -g and du -g http://lists.gnu.org/archive/html/bug-coreutils/2009-12/msg00000.html

Yeah, the 'existing implementation' argument does carry some weight (then again, witness my patch today to nuke 'rm -d' even though that was also based on the 'existing implementation' argument).

The only reason one would support these is for compat with FreeBSD, and if we did, we wouldn't want to promote their use through documentation.

Or, maybe what we should do is:

now:

make 'du--megabytes' issue a warning (it is the wrong word for what it does).

document -m, with --block-size=M as the long-option spelling add -g, with --block-size=G as the long-option spelling

in a few years: remove 'du --megabytes' altogether

-- Eric Blake address@hidden +1-801-349-2682 Libvirt virtualization library http://libvirt.org