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R

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

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