I have always noticed that when people ask the question 'How do I figure out how much hard drive space I have left' as it relates to the Linux / *nix shell, people always respond telling people to use the following command:

df

Output:

$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sdb5             56870784  22222576  31759324  42% /
...
/dev/sda1               252960    122460    130496  49% /media/sda1
/dev/sda3            1441394492 1372242748  69151740  96% /media/sda3

In the above example, everything is hard to read since it's in units of one thousand bytes. On some systems this defaults to multiples of 512 bytes unless you specific the -k option. I'm surprised that they don't mention that if you add one simple switch (-h for human readable), you can make the output much easier to read on most systems:

df -h

Output:

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb5              55G   22G   31G  42% /
...
/dev/sda1             248M  120M  128M  49% /media/sda1
/dev/sda3             1.4T  1.3T   66G  96% /media/sda3

In the above example, you can see that I've used 1.3 terabytes of my main system drive, leaving me with 66 gigabytes free.

Side Note: You can also find out what file system type you are using by running the following command:

df- T

And it will produce the following results:

Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/hdb1     ext3    19228276  14737848   3513680  81% /
tmpfs        tmpfs      383960         4    383956   1% /dev/shm
(The second column is the type)

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Name: Joshua Lyon
Birthday: August 8, 1985
Location: Valley Ranch (Irving), TX
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