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Glossary
root
RS-232C
shell
shell script
signal
single-user
special file
spool
1.
2.
3.
4.
A distinguished directory that constitutes the
origin of the directory hierarchy in a file
system
[1].
Specifically, the origin for the file system [2]
with the conventional path name slash (/).
The origin of the directory hierarchy in a file
system
[1].
The super user login.
An industry standard for asynchronous serial data
communications between terminal devices, such
as printers, computers, and communications
equipment. This standard defines a 25-pin
connector and certain signal characteristics for
interfacing equipment.
1. The program sh, which causes other
programs to be executed on command; the
shell is usually started on a user’s behalf
when the user logs in.
2. By analogy, any program started upon
logging in.
An executable file of commands taken as input to
the shell.
An exceptional occurrence that causes a process
to terminate or divert from the normal flow of
control; see interrupt.
A state of the operating system in which only
one user is supported.
An i-node that designates a device, further
categorized as either a block special file
describing a block device, or a character special
file describing a character device.
To collect and serialize output from multiple
processes competing for a single output service.
GLOSSARY GL-7