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R

• raise - send a signal to the executing process
• rand, rand_r - pseudo-random number generator
• random - generate pseudorandom number
• raw - set Raw Mode
• re_comp, re_exec - compile and execute regular expressions
• re_comp.h - regular-expression-matching functions for re_comp()
• read, readv, pread - read from a file
• read - read a line from standard input (XCU)
• read, readv - read from file (XNS)
• readdir, readdir_r - read directory
• readlink - read the contents of a symbolic link
• readonly - Set Read-only Attribute for Variables (Shell Built-in)
• readv - vectored read from file
• 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
• redrawwin, wredrawln - line update status functions
• refresh - refresh current window
• regcmp, regex - compile and execute a regular expression
• regcomp, regexec, regerror, regfree - regular expression matching
• regex - execute a regular expression
• regex.h - regular-expression-matching types
• regexp.h - regular-expression declarations
• remainder - remainder function
• remove - remove files
• remque - remove an element from a queue
• rename - rename a file
• renice - set system scheduling priorities of running processes
• reset_prog_mode, reset_shell_mode
• resetty, savetty - save/restore terminal mode
• restartterm - change terminal type
• return - Return from a Function (Shell Built-in)
• rewind - reset file position indicator in a stream
• rewinddir - reset position of directory
• rindex - character string operations
• rint - round-to-nearest integral value
• ripoffline - reserve a line for a dedicated purpose
• rm - remove directory entries
• rmdel - remove a delta from an SCCS file (DEVELOPMENT)
• rmdir - remove a directory
• rmdir - remove directories (XCU)

• radix character
• read-only file system
• read-write lock
• real group ID
• real time
• Real Time Functionality
• real user ID
• redirection
• redirection operator
• reentrant function
• referenced shared memory object
• refresh
• regular expression
• Regular Expressions
• region
• regular file
• relative pathname
• (time) resolution
• root directory
• runnable process (or thread)
• running process (or thread)