[issue845] df() shell function

[Andras Korn]

New submission from Andras Korn <korn-grml at elan.rulez.org>:

Hi,

please consider including this in your zshrc:

function df() {
	/bin/df -a --portability "$@" | column -t | sed
's/Mounted[[:space:]]*on/Mounted on/'
}

This makes df output a lot more readable by making sure that all information for
each filesystem is on a single line and still nicely tabulated.

Observe the difference between the old and new behaviour:

Old:

Filesystem            Size  Used Avail Use% Mounted on
/dev/md0              254M  170M   85M  67% /
tmpfs                 3.9G     0  3.9G   0% /lib/init/rw
udev                   10M  516K  9.5M   6% /dev
tmpfs                 3.9G  2.4M  3.9G   1% /dev/shm
/dev/mapper/unencrypted-tmp
                      1.1G  164M  951M  15% /tmp
/dev/mapper/unencrypted-usr
                      1.8G  757M  1.1G  42% /usr
/dev/mapper/unencrypted-var
                     1014M  162M  853M  16% /var
/dev/mapper/unencrypted-var_log_sv
                      124M   40M   85M  32% /var/log/sv
/dev/mapper/unencrypted-var_cache_apt
                      764M  433M  331M  57% /shared/var_cache_apt
/dev/mapper/encrypted-netflow
                      2.0G  2.0G   67M  97% /var/spool/netflow

New:

Filesystem                               Size   Used  Avail  Use%  Mounted on
/dev/md0                                 254M   170M  85M    67%   /
tmpfs                                    3.9G   0     3.9G   0%    /lib/init/rw
udev                                     10M    516K  9.5M   6%    /dev
tmpfs                                    3.9G   2.4M  3.9G   1%    /dev/shm
/dev/mapper/unencrypted-tmp              1.1G   164M  951M   15%   /tmp
/dev/mapper/unencrypted-usr              1.8G   757M  1.1G   42%   /usr
/dev/mapper/unencrypted-var              1014M  162M  853M   16%   /var
/dev/mapper/unencrypted-var_log_sv       124M   40M   85M    32%   /var/log/sv
/dev/mapper/unencrypted-var_cache_apt    764M   433M  331M   57%  
/shared/var_cache_apt
/dev/mapper/encrypted-netflow            2.0G   2.0G  67M    97%  
/var/spool/netflow

Including the -a (which causes "dummy" filesystems to be included) is useful
especially for chroots and vservers with bind mounted filesystems; if /etc/mtab
includes an entry where the device doesn't exist, df will by default skip that
entry in the output, which is the wrong thing to do for bind mounts. I don't
think there are so many actual dummy filesystems that their inclusion would
seriously clutter the output of df.

Placing this function in zshrc would ensure that it's only loaded for
interactive shells; thus it wouldn't interfere with scripts that attempt to
parse the output of df(1).

----------
messages: 3151
nosy: korn
priority: wish
status: unread
title: df() shell function
topic: zsh

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