glossary.9 (2010 09)

h
glossary(9) glossary(9)
hierarchical directory
A directory (or file system) structure in which each directory can contain other directories as well as files.
home directory
The directory name given by the value of the environment variable
HOME. When you first log in, login(1)
automatically sets
HOME to your login directory. You can change its value at any time. This is usually
done in the
.profile file contained in your login directory. Setting
HOME does not affect your login
directory; it simply gives you a convenient way of referring to what is probably your most commonly
used directory.
host name
A string of bytes that uniquely identifies the system in the network. The host name for your system can
be viewed and/or set with the hostname (1) command. More information can be found in the hostname (5)
manpage. See also node name.
image
The current state of your computer (or your portion of the computer, on a multiuser system) during the
execution of a command. Often thought of as a "snapshot" of the state of the machine at any particular
moment during execution.
init
A system process that performs initialization, is the ancestor of every other process in the system, and
is used to start login processes.
init usually has a process ID of 1. See init (1M).
interleave factor
A number that determines the order in which sectors on a mass storage medium are accessed. It can be
optimized to make data acquisition more efficient.
inode
An inode is a structure that describes a file and is identified in the system by a file serial number.
Every file or directory has associated with it an inode. Permissions that specify who can access the file
and how are kept in a 9-bit field that is part of the inode. The inode also contains the file size, the user
and group ID of the file, the number of links, and pointers to the disk blocks where the file’s contents can
be found. Each connection between an inode and its entry in one or more directories is called a link.
inode number
See file serial number.
Internal Terminal Emulator (ITE)
The "device driver" code contained in the HP-UX kernel that is associated with the computer’s built-in
keyboard and display or with a particular keyboard and display connected to the computer, depending on
the Series and Model of system processor. See system console and the System Administrator manuals
supplied with your system for details.
internationalization
The concept of providing software with the ability to support the native language, local customs, and
coded character set of the user.
interrupt signal
The signal sent by
SIGINT (see signal (2)). This signal generally terminates whatever program you are
running. The key which sends this signal can be redefined with ioctl (2) or stty (1) (see termio (7)). It is
often the ASCII DEL (rubout) character (the DEL key) or the BREAK key. Ctrl-C is often used instead.
intrinsic
See system call.
I/O redirection
A mechanism provided by the HP-UX shell for changing the source of data for standard input and/or the
destination of data for standard output and standard error. See sh(1).
ITE
See Internal Terminal Emulator.
10 Hewlett-Packard Company − 10 − HP-UX 11i Version 3: September 2010