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 )