all the mounted drives. If a directory is specied, the information is limited to the
drive on which that directory is located.
-h
Shows the number of occupied blocks in gigabytes, megabytes, or kilobytes—in
human-readable format
-T
Type of le system (ext2, nfs, etc.)
du [options] [path]
This command, when executed without any parameters, shows the total disk
space occupied by les and subdirectories in the current directory.
-a
Displays the size of each individual le
-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 “The free
Command” (Chapter 18, Special System Features, ↑Reference) for more informa-
tion.
-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.
7.12.2.2 Processes
top [options]
top provides a quick overview of the currently running processes. Press [H] to
access a page that briey explains the main options for customizing the program.
112 Start-Up
