Library /sys$common/syshlp/helplib.hlb
PIPE, Description, Pipelines and TEEs, Using SYS$COMMAND
 *Conan The Librarian 

    The SYS$COMMAND of a subprocess is normally the same as its
    SYS$INPUT (if no command procedures are involved). In a
    pipeline, however, the SYS$COMMAND of a subprocess is set to
    the SYS$COMMAND of the parent process instead of to the preceding
    pipe (which is the SYS$INPUT of the pipeline-segment command).
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