Report file system disk usage. It has these switches:

-a	--all	include dummy file systems
-B	--block-size=[size]	display a different block size so it's easier to read.
-h	--human-readable	prints sizes in human readable format i.e. 1M, 1K, etc.
-H	--si	use powers of 1000 instead of 1024
-i	--inodes	list inode usage instead of block size
-k		like --block-size=1K
-l	--local	limit listing to the local file system
	--no-sync	do not invoke sync before getting usage info (default)
-P	--portability	use the POSIX format
	--sync	invoke sync before getting usage info
-t	--type=[type]	limit listing to file systems of type [type]
-T	--print-type	print file system type
-x	--exclude-type=]type]	limit listing to file system of type [type]
	--help	uh... list help?
	-version	print the version

kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y. Size:

mkdir [directory name]

command	switches	description
mkdir [name]		makes a directory with directory name
rmdir [name]		removes a directory named [name]
rm	-rf	removes a directory and all files and directories under it

Making a directory with a specific name