HP-UX Reference (11i v1 05/09) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

c
glossary(9) glossary(9)
command
A directive to perform a particular task. HP-UX commands are executed through a command inter-
preter called a shell. HP-UX supports several shells, including the POSIX shell (sh-posix(1)), the Bourne
shell (sh-bourne(1)), the Korn shell (ksh(1)), and the C shell (csh(1)), See sh(1) for more information about
supported shells. Most commands are carried out by an executable file, called a utility, which might take
the form of a stand-alone unit of executable object code (a program) or a file containing a list of other pro-
grams to execute in a given order (a shell script). Scripts can contain references to other scripts, as well as
to object-code programs. A typical command consists of the utility name followed by arguments that are
passed to the utility. For example, in the command,
ls mydirectory , ls is the utility name and
mydirectory is an argument passed to the
ls utility.
command interpreter
A program which reads lines of text from standard input (typed at the keyboard or read from a file), and
interprets them as requests to execute other programs. A command interpreter for HP-UX is called a
shell. See sh(1) and related manual entries.
Command Set 1980
See CS/80.
composite graphic symbol
A graphic symbol consisting of a combination of two or more other graphic symbols in a single character
position, such as a diacritical mark and a basic letter.
control character
A character other than a graphic character that affects the recording, processing, transmission, or interpre-
tation of text. In the ASCII character set, control characters are those in the range 0 through 31, and
127. Control characters can be generated by holding down the control key (which may be labeled CTRL,
CONTROL, or CNTL depending on your terminal), and pressing a character key (as you would use SHIFT).
These two-key sequences are often written as, for example, Control-
D, Ctrl-D,orˆD
, where ˆ stands for
the control key.
controlling process
The session leader that establishes the connection to the controlling terminal. Should the terminal sub-
sequently cease to be a controlling terminal for this session, the session leader ceases to be the controlling
process.
controlling terminal
A terminal that is associated with a session. Each session can have at most one controlling terminal associ-
ated with it and a controlling terminal is associated with exactly one session. Certain input sequences from
the controlling terminal cause signals to be sent to all processes in the foreground process group associated
with the controlling terminal.
Coordinated Universal Time (UTC)
See Epoch.
CS/80, CS-80
A family of mass storage devices that communicate with the controlling computer by means of a series of
commands and data transfer protocol referred to as the CS/80 (Command Set 1980) command set. This
command set was implemented in order to provide better forward/backward compatibility between models
and generations of mass storage devices as technological advances develop. Some mass storage devices
support only a subset of the full CS/80 command set, and are usually referred to as SS/80 (Subset 1980)
devices.
crash
The unexpected shutdown of a program or system. If the operating system crashes, this is a "system
crash", and requires the system to be rebooted.
current directory
See working directory.
HP-UX 11i Version 1: September 2005 − 4 − Hewlett-Packard Company Section 9−−5