bug#37702: Suggestion for 'df' utility

[Paul Eggert]

On 10/11/19 11:20 AM, Pádraig Brady wrote:
> if you want to exclude nested file systems like that,
> you could try:
>
>    alias df='df -x squashfs'

On my Fedora 30 workstation that option doesn't make any difference. 
Regardless of whether '-x squashfs' is used, I see this output from 'df':

Filesystem      1K-blocks      Used  Available Use% Mounted on
devtmpfs          4065704         0    4065704   0% /dev
tmpfs             4081560     36616    4044944   1% /dev/shm
tmpfs             4081560      1696    4079864   1% /run
tmpfs             4081560         0    4081560   0% /sys/fs/cgroup
/dev/sda5        59614116  16910684   39645412  30% /
tmpfs             4081560       124    4081436   1% /tmp
/dev/sda2      1849433716 207781976 1547682948  12% /home
/dev/sda1         5095040    244468    4572044   6% /boot
tmpfs              816312        60     816252   1% /run/user/1000

and most of these lines are useless.

For many years we've put up with the problem of too many filesystems in 
the default plain 'df' output, and now's as good a time as any to fix 
that. On my workstation there should be only four lines of information, 
one each for /, /home, /boot, and the shared tmpfs area.

Presumably readonly filesystems should also be omitted by default, since 
they're not something people ordinarily care about.

We can add a flag or two for the rare people who want to see these 
normally-useless lines.