The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2016 The IEEE and The Open Group, All Rights reserved.

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### R

- raise() - send a signal to the executing process
- rand(), rand_r, srand - pseudo-random number generator
- random(), initstate, setstate, srandom - pseudo-random number functions
- rand_r(), rand, srand - pseudo-random number generator
- read - read from standard input into shell variables
- read(), pread - read from a file
- readdir(), readdir_r - read a directory
- readdir_r(), readdir - read a directory
- readlink(), readlinkat - read the contents of a symbolic link
- readlinkat(), readlink - read the contents of a symbolic link
- readonly - set the readonly attribute for variables
- readv() - read a vector
- realloc() - memory reallocator
- realpath() - resolve a pathname
- recv() - receive a message from a connected socket
- recvfrom() - receive a message from a socket
- recvmsg() - receive a message from a socket
- regcomp(), regerror, regexec, regfree - regular expression matching
- regerror(), regcomp, regexec, regfree - regular expression matching
- regex.h - regular expression matching types
- regexec(), regcomp, regerror, regfree - regular expression matching
- regfree(), regcomp, regerror, regexec - regular expression matching
- remainder(), remainderf, remainderl - remainder function
- remainderf(), remainder, remainderl - remainder function
- remainderl(), remainder, remainderf - remainder function
- remove() - remove a file
- remque(), insque - insert or remove an element in a queue
- remquo(), remquof, remquol - remainder functions
- remquof(), remquo, remquol - remainder functions
- remquol(), remquo, remquof - remainder functions
- rename(), renameat - rename file
- renameat(), rename - rename file
- renice - set nice values of running processes
- return - return from a function or dot script
- rewind() - reset the file position indicator in a stream
- rewinddir() - reset the position of a directory stream to the beginning of a directory
- rint(), rintf, rintl - round-to-nearest integral value
- rintf(), rint, rintl - round-to-nearest integral value
- rintl(), rint, rintf - round-to-nearest integral value
- rm - remove directory entries
- rmdel - remove a delta from an SCCS file (DEVELOPMENT)
- rmdir - remove directories
- rmdir() - remove a directory
- round(), roundf, roundl - round to the nearest integer value in a floating-point format
- roundf(), round, roundl - round to the nearest integer value in a floating-point format
- roundl(), round, roundf - round to the nearest integer value in a floating-point format

Topics

- Radix Character
- Read-Only File System
- Read-Write Lock
- Real Group ID
- Real Time
- Real User ID
- Realtime Signal Extension
- Record
- Redirection Operator
- Redirection
- Referenced Shared Memory Object
- Refresh
- Region
- Regular Expression Definitions
- Regular Expression General Requirements
- Regular Expression Grammar
- Regular Expression
- Regular Expressions
- Regular File
- Relative Pathname
- Relocatable File
- Relocation
- Requested Batch Service
- Robust Mutex
- Root Directory
- Runnable Process (or Thread)
- Running Process (or Thread)