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R

• raise() — send a signal to the executing process
• rand(), 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 — display the contents of a symbolic link
• 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(), reallocarray — memory reallocators
• reallocarray(), realloc — memory reallocators
• realpath — resolve a pathname
• 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

• 3.294 Radix Character (or Decimal-Point Character)
• 3.295 Read-Only File System
• 3.296 Read-Write Lock
• 3.297 Real Group ID
• 3.298 Real Time
• 3.299 Realtime Signal Extension
• 3.300 Real User ID
• 3.301 Record
• 3.302 Record Lock
• 3.303 Redirection
• 3.304 Redirection Operator
• 3.305 Referenced Shared Memory Object
• 3.306 Refresh
• 3.307 Regular Built-In Utility (or Regular Built-In)
• 3.308 Regular Expression
• 3.309 Region
• 3.310 Regular File
• 3.311 Relative Pathname
• 3.312 Relocatable File
• 3.313 Relocation
• 3.315 Robust Mutex
• 3.316 Root Directory
• 3.317 Runnable Process (or Thread)
• 3.318 Running Process (or Thread)
• 9. Regular Expressions
• 9.1 Regular Expression Definitions
• 9.2 Regular Expression General Requirements
• 9.5 Regular Expression Grammar