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halt
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halt writes file system status information in random access memory
(RAM) to the disks and then stops the processor. This command is equivalent to init
0.
halt normally logs the system shutdown to the system log daemon, syslogd,
and places a shutdown record in the login accounting file /var/adm/wtmpX.
Hard Disk
- The hard disk is made up of magnetic storage devices that read information
stored on the disk and write instructions to main memory.
Hard Link
- A hard link associates one or more file names with an inode, a data structure
describing a file on a disk. Every directory is linked to itself as well as to
its parent directory.
Hardware Carrier Detect
- When a port is used for both dialing in and dialing out, the modem must be
set to use hardware carrier detect so that it raises the data carrier detect (DCD)
when there is an active carrier signal on the phone connection. Then when the
call hangs up, DCD goes low (the voltage changes) and the modem can be used for
dialing out.
Headless System
- A headless system is a system without a monitor that is capable of displaying
bitmapped graphics (no Frame Buffer ). It cannot display the graphical interfaces required for Web Start
installation or programs such as Admintool. When access is needed, a serial
ASCII terminal can be connected.
Hidden File
- Hidden files are files that have names beginning with a dot (.). An example
of a hidden file is .wastebasket.
history
- history is a feature of the C shell and Korn shell that allows
repetition of previously entered commands. In the Korn shell, the history
command is a built-in alias. The history command without arguments
displays the last 16 command lines to the screen.
History First Last
In the Korn shell, specifying a range (first last) displays the range of
command lines to the screen.
history n
In the Korn shell, specifying history with the n argument (no minus in
front of the n) displays all commands from command n onwards.
home Directory
- A home directory is the user's own directory, which is set up by the system
administrator.
Host
- A host is a computer system in a network computing environment.
Host Name
- The hostname is a unique name identifying a host machine connected to a
network. The name must be unique on the network. The hostname command
is used to determine a system's host name.
Host ID
- The host ID is a unique system ID which is maintained on the
NVRAM . The hostid command is used to determine a system's host ID.
Hot Spare
- A hot spare is a slice that automatically comes online and resyncs after a
mirror has become unavailable. Hot spares are created in a hot spare pool from
which the software can choose an available drive.
Hot Plug
- Hotplugging refers to the ability to add or remove hardware components while
the system bus and devices are powered up.
HTML
- Hypertext Markup Language (HTML) is a page description language for the World
Wide Web.
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