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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

• 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)