df

Displays the free disk space of currently mounted file systems. This command differs from /usr/bin/df in several ways:

• Blocks sizes are reported in units of 1024-bytes in this version of df, while /usr/bin/df uses 512-byte blocks.

• Perhaps the most obvious difference between the two versions of this command is their output format, as shown by the example below.

$ /usr/ucb/df
Filesystem	kbytes	used	avail	capacity	Mounted on
/dev/root	1750592	826496	749032	52%	/
$ df
/	(/dev/root	):	231024 blocks	105323 files
/proc	(/proc	):	     0 blocks	123 files