man pages section 2: System Calls
    
R
 
 read from file -- read ( Index Term Link )
  pread ( Index Term Link )
  readv ( Index Term Link )
 
 read the contents of a symbolic link -- readlink ( Index Term Link )
 
 read/write file pointer
  move -- lseek ( Index Term Link ) ( Index Term Link )
 
 readlink -- read the contents of a symbolic link ( Index Term Link )
 
 read -- read from file ( Index Term Link )
 
 real group ID, set -- setregid() ( Index Term Link )
 
 real user ID, set -- setreuid() ( Index Term Link )
 
 reboot system, -- uadmin ( Index Term Link )
 
 remount root file system, -- uadmin ( Index Term Link )
 
 remove directory entry -- unlink ( Index Term Link )
 
 remove directory entry -- unlinkat ( Index Term Link )
 
 rename -- change the name of a file ( Index Term Link )
 
 resolve all symbolic links of a path name -- resolvepath ( Index Term Link )
 
 resolvepath -- resolve all symbolic links of a path name ( Index Term Link )
 
 rmdir -- remove a directory ( Index Term Link )
 
 root directory, change -- chroot ( Index Term Link )