man pages section 2: System Calls
    
R
 
 read from a file, pread, preadl, read, readv, readvl ( Index Term Link )
 
 read -- read from a file ( 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 )
 
 readl -- read from a file ( Index Term Link )
 
 readlink -- read the contents of a symbolic link ( Index Term Link )
 
 readv -- read from a file ( Index Term Link )
 
 readvl -- read from a file ( Index Term Link )
 
 real group ID, set -- setregid ( Index Term Link )
 
 real user IDs, set -- setreuid ( Index Term Link )
 
 reboot system, -- uadmin ( Index Term Link )
 
 remount root file system, -- uadmin ( Index Term Link )
 
 rename -- change the name of a file ( Index Term Link )
 
 rmdir -- remove a directory ( Index Term Link )
 
 root directory, change -- chroot ( Index Term Link )