Novell LINUX ENTERPRISE SERVER 10 SP2 - INSTALLATION AND ADMINISTRATION Installation Manual page 391

du [options] [path]
This command, when executed without any parameters, shows the total disk space
occupied by files and subdirectories in the current directory.
-a
Displays the size of each individual file
-h
Output in human-readable form
-s
Displays only the calculated total size
free [options]
The command free displays information about RAM and swap space usage,
showing the total and the used amount in both categories. See Section 22.1.6, "The
free Command" (page 430) for more information.
-b
Output in bytes
-k
Output in kilobytes
-m
Output in megabytes
date [options]
This simple program displays the current system time. If run as root, it can also
be used to change the system time. Details about the program are available in the
date(1) man page.
Processes
top [options]
top provides a quick overview of the currently running processes. Press H to access
a page that briefly explains the main options for customizing the program.
Working with the Shell 373