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 | Bulletin # 8     SYS$COMMAND - No UNIX Equivalent       Updated: 06/27/96 |
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  The UNIX operating system provides the concept of three "standard" I/O 
  streams:

    stdin  - the Standard Input  Stream (OpenVMS equivalent: SYS$INPUT)
    stdout - the Standard Output Stream (OpenVMS equivalent: SYS$OUTPUT)
    stderr - the Standard Error  Stream (OpenVMS equivalent: SYS$ERROR)

  The OpenVMS operating system provides a fourth I/O stream, which has no
  UNIX equivalent:

    SYS$COMMAND - The Standard Command Stream

  The command stream can be (and frequently is) different from the SYS$INPUT
  stream, especially in a batch job.

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