SPU

Glossary System Processing Unit. The instruction-processing module of the computer.

standard error

The destination of error and special messages from a program, in tended to be used for diagnostic messages. The standard error output is often called stderr , and is automatically opened b y the shell for writing on ￿le descriptor 2 for ev ery command invoked. Standard error usually appears on the display unless it is directed otherwise.

standard input

The source of input data for a program. The standard input ￿le is often called stdin, and is automatically opened b y the shell for reading on ￿le descriptor 0 for ev ery command invoked.

standard output

The destination of output data from a program. The standard output ￿le is often called stdout , and is automatically opened b y the shell for writing on ￿le descriptor 1 for ev ery command invoked. Standard output appears on the display unless it is redirected otherwise.

SU

Super User. See root user.

system name

The eight-character (or less) string whic h uniquely identi￿es a system. Usually identical with the system's host name found in /etc/hosts . The Internet Protocol (IP) n umber is sometimes used instead of a system name to identify the system.

tree structure

The HP-UX method of organizing ￿les and directories in to a hierarchical structure. This structure looks like an in verted tree with the \root" directory at the top, descending in to multiple directory/￿le branc hes that end in clusters of ￿les.

uid

User ID.

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