HP-UX Reference (11i v1 00/12) - 5 Miscellaneous Topics, 7 Device (Special) Files, 9 General Information, Index (vol 9)

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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man9/!!!intro.9
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q
glossary(9) glossary(9)
(Some systems do not support core images, and on those systems no such file is generated.)
radix character
The character that separates the integer part of a number from the fractional part. For
example, in American usage, the radix character is a decimal point, while in Europe, a
comma is used.
raw disk The name given to a disk for which there exists a character special file that allows direct
transmission between the disk and the user’s read or write buffer. A single read or write
call results in exactly one I/O call.
read-only file system
A characteristic of a file system that prevents file system modifications.
real group ID
A positive integer which is assigned to every user on the system. The association of a user
and his or her real group ID is done in the file /etc/passwd. The modifier ‘‘real’’ is
used because a user can also have an effective group ID. The real group ID can then be
mapped to a group name in the file /etc/group, although it need not be. Thus, every
user is a member of some group (which can be nameless), even if that group has only one
member.
Every time a process creates a child process (via fork(2)), that process has a real group ID
equal to the parent process’s real group ID. This is useful for determining file access
privileges within the process.
real user ID A positive integer which is assigned to every user on the system. A real user ID is assigned
to every valid login name in the file /etc/passwd . The modifier ‘‘real’’ is used because
a user can also have an effective user ID (see effective user ID).
Every time a process creates a child process (via fork(2)), that process has a real user ID
equal to the parent process’s real user ID. This is useful for determining file access
privileges within the process.
regular expression
A string of zero or more characters that selects text. All the characters contained in the
string might be literal, meaning that the regular expression matches itself only; or one or
more of the characters might be a metacharacter, meaning that a single regular expres-
sion could match several literal strings. Regular expressions are most often encountered in
text editors (such as ed(1), ex(1), or vi(1)), where searches are performed for a specific piece
of text, or in commands that were created to search for a particular string in a file (most
notably grep(1)). Regular expressions are also encountered in the shell, especially when
referring to file names on command lines.
regular file A type of file that is a randomly accessible sequence of bytes, with no further structure
imposed by the system. Its size can be extended. A regular file is also called an ordinary
file.
relative path name
A path name that does not begin with a slash (
/). It indicates that a file’s location is
given relative to your current working directory, and that the search begins there
(instead of at the root directory). For example, dir1/file2 searches for the directory
dir1 in your current working directory; then dir1 is searched for the file file2.
root directory
(1) The highest level directory of the hierarchical file system, from which all other files
branch. In HP-UX, the slash (
/) character refers to the root directory. The root direc-
tory is the only directory in the file system that is its own parent directory.
(2) Each process has associated with it a concept of a root directory for the purpose of
resolving path name searches for those paths beginning with slash (/). A process’s root
directory need not be the root directory of the root file system, and can be changed by the
chroot(1M) command or chroot(2) system call. Such a directory appears to the process
involved to be its own parent directory.
root volume The mass storage volume which contains the boot area (which contains the HP-UX kernel)
and the root directory of the HP-UX file system.
HP-UX Release 11i: December 2000 − 16 − Section 9−−17
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