man pages section 3: Basic Library Functions
    
R
 
 raise - send signal to program ( Index Term Link )
 
 rand -- simple random number generator ( Index Term Link )
 
 rand -- simple random-number generator ( Index Term Link )
 
 random -- pseudorandom number functions ( Index Term Link )
 
 random number generator
  -- drand48 ( Index Term Link )
  -- erand48 ( Index Term Link )
  -- jrand48 ( Index Term Link )
  -- lcong48 ( Index Term Link )
  -- lrand48 ( Index Term Link )
  -- mrand48 ( Index Term Link )
  -- nrand48 ( Index Term Link )
  -- rand ( Index Term Link )
  -- seed48 ( Index Term Link )
  -- srand48 ( Index Term Link )
 
 random number generator, simple
  -- rand ( Index Term Link )
  -- srand ( Index Term Link )
 
 re_comp -- compile and execute regular expressions ( Index Term Link )
 
 re_exec -- compile and execute regular expressions ( Index Term Link )
 
 read a string of characters without echo -- getpass ( Index Term Link )
 
 read a directory entry - readdir ( Index Term Link )
 
 read a string of characters without echo, -- getpassphrase ( Index Term Link )
 
 read directory
  -- readdir ( Index Term Link )
  -- readdir_r ( Index Term Link )
 
 readdir -- read directory ( Index Term Link )
 
 readdir - read a directory entry ( Index Term Link )
 
 readdir -- read directory, POSIX ( Index Term Link )
 
 readdir_r -- read directory ( Index Term Link )
 
 realloc - memory allocator ( Index Term Link )
 
 realpath - resolve pathname ( Index Term Link )
 
 reboot - reboot system or halt processor ( Index Term Link )
 
 regcmp -- compile regular expression ( Index Term Link )
 
 regcomp -- regular expression matching ( Index Term Link )
 
 regerror -- regular expression matching ( Index Term Link )
 
 regex -- execute regular expression ( Index Term Link )
 
 regexec -- regular expression matching ( Index Term Link )
 
 regfree -- regular expression matching ( Index Term Link )
 
 register a function to run at process termination or object unloading- atexit ( Index Term Link )
 
 regular expression matching
  -- regcomp ( Index Term Link )
  -- regerror ( Index Term Link )
  -- regexec ( Index Term Link )
  -- regfree ( Index Term Link )
 
 regular expressions, compile and execute -- regcmp, regex ( Index Term Link )
 
 remove - remove file ( Index Term Link )
 
 remque -- remove elment from a queue ( Index Term Link )
 
 reposition a file-position indicator in a stream
  -- fseek ( Index Term Link )
  -- fseeko ( Index Term Link )
 
 reset file position indicator in a stream - rewind ( Index Term Link )
 
 reset position of directory stream to the beginning of a directory - rewinddir ( Index Term Link )
 
 resetmnttab -- get mnttab file information ( Index Term Link )
 
 resolve pathname - realpath ( Index Term Link )
 
 resource utilization, get information - getrusage ( Index Term Link )
 
 return a file offset for a file descriptor - tell ( Index Term Link )
 
 return a file offset in a stream
  -- ftell ( Index Term Link )
  -- ftello ( Index Term Link )
 
 return pathname of executable - getexecname ( Index Term Link )
 
 rewind - reset file position indicator in a stream ( Index Term Link )
 
 rewinddir - reset position of directory stream to the beginning of a directory ( Index Term Link )
 
 rindex -- string operations ( Index Term Link )