- rar
 
      - read, [1]
 
      - readlink
 
      - realpath
 
      - reboot
 
      - renice
 
      - 
    RFC
      
        - RFC 114
 
        - RFC 1350
 
        - RFC 1421
 
        - RFC 1422
 
        - RFC 1423
 
        - RFC 1424
 
        - RFC 1855
 
        - RFC 2052
 
        - RFC 2131, [1], [2], [3]
 
        - RFC 2132, [1], [2], [3], [4], [5]
 
        - RFC 2315, [1]
 
        - RFC 2348
 
        - RFC 2606
 
        - RFC 2782
 
        - RFC 3156
 
        - RFC 3442, [1]
 
        - RFC 4578
 
        - RFC 4880, [1]
 
        - RFC 5228
 
        - RFC 5280
 
        - RFC 6376
 
        - RFC 6762, [1]
 
        - RFC 6797, [1]
 
        - RFC 6960
 
        - RFC 7208
 
        - RFC 7292
 
        - RFC 7508
 
        - RFC 792
 
        - RFC 821
 
        - RFC 8551
 
        - RFC 951
 
        
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