Knowing which disks are
mounted, and how much disk space is available on each disk, is crucial in controlling your
system. Running out of disk space on the root partition of your system is a major problem.
The df command is a simple way to see what is happening on each of the mounted disks:
rich@testing:~> df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hda3 7050802 2399319 4293234 36% /
udev 127668 100 127568 1% /dev
/dev/hda4 9904349 36631 9364482 1% /home
/dev/hda1 21327868 12450016 8877852 59% /windows/C
/dev/sda1 994528 404432 590096 41% /media/USB DISK
rich@testing:~>
CHAPTER 33 Command-Line Master Class 662
The output from the df command shows each physical partition that is currently
mounted (even removable devices such as USB memory sticks). For each partition, the
total amount of space, the space used, and the space available are all shown. And for the
mathematically-challenged, it even calculates the percent of used disk space.
Running Processes
There aren??™t many commands more powerful than the ps command. It can tell you an
extraordinary amount of things about your machine and how it runs.
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