Cleaning up df output

I use df a lot on ubuntu. Unfortunately with advent of snap devices df output has become increasingly cluttered with various devices mounted by the system that I generally don' have an interest in seeing.

For example:

# /bin/df
Filesystem      1K-blocks       Used Available Use% Mounted on
udev              8121812          0   8121812   0% /dev
tmpfs             1630708       1888   1628820   1% /run
/dev/sda1        30627388   15252072  13796484  53% /
tmpfs             8153528      68012   8085516   1% /dev/shm
tmpfs                5120          4      5116   1% /run/lock
tmpfs             8153528          0   8153528   0% /sys/fs/cgroup
/dev/loop1          93184      93184         0 100% /snap/core/6405
/dev/loop2          93184      93184         0 100% /snap/core/6350
/dev/loop4          35456      35456         0 100% /snap/gtk-common-themes/818
/dev/loop7          35712      35712         0 100% /snap/gtk-common-themes/1122
/dev/sda2        76766240   26915652  45927952  37% /home
/dev/sdb       7814026584 7137072996 674941212  92% /mnt/library
/dev/sdc       3907018584 3436394816 467552000  89% /mnt/archive
tmpfs             1630704         16   1630688   1% /run/user/132
tmpfs             1630704         80   1630624   1% /run/user/1000
/dev/loop8          36224      36224         0 100% /snap/gtk-common-themes/1198
/dev/loop9          93312      93312         0 100% /snap/core/6531
/dev/loop0       48768594   48768594         0 100% /mnt/loop/Archive.TV.01
/dev/loop3       48628258   48628258         0 100% /mnt/loop/Archive.TV.02
/dev/loop5       48845728   48845728         0 100% /mnt/loop/Archive.TV.03


So that you don't have to visually hunt through that junk to see what you need add this to your users .bashrc file:

function df
{
  /bin/df "$@" | grep -v loop | grep -v tmpfs | grep -v udev
}

Now your df output just lists the actual mounted drives:

#df

Filesystem      1K-blocks       Used Available Use% Mounted on

/dev/sda1        30627388   15252080  13796476  53% /

/dev/sda2        76766240   26915652  45927952  37% /home

/dev/sdb       7814026584 7137072996 674941212  92% /mnt/library

/dev/sdc       3907018584 3436700752 467246064  89% /mnt/archive

/dev/loop0       48768594   48768594         0 100% /mnt/loop/Archive.TV.01

/dev/loop3       48628258   48628258         0 100% /mnt/loop/Archive.TV.02

/dev/loop5       48845728   48845728         0 100% /mnt/loop/Archive.TV.03

If you want see the full output use the full path /bin/df

autofs: keep devices permanently mounted

I have some ISO images which I use autofs to mount as loop devices.

For reasons that are not important I want them to stay mounted permanently.

I couldn't find any information online on how to do this so I poked around in the related autofs man pages.

I noticed that there is a time out option which is set by default to 600 seconds.

I wondered what would happen if I set that to 0 seconds so I tried it.

So far the devices in question have stayed mounted for 15 minutes

Here's how to do it:

/etc/auto.master
/mnt/loop /etc/auto.loops -t 0

/etc/auto.loops

* -fstype=iso9660,loop     :/store/ISO.archives/&.iso

The -t 0 is where we set the time out to 0 (infinite)

   

In case you are wondering the * at the beginning and the &.iso at the end of auto.loops will mount all of the iso files found in the /store/ISO.archives/ directory.