Library /sys$common/syshlp/HELPLIB.HLB  —  PIPE  Description  Pipelines and TEEs, Image Verification in a Pipeline
    In a pipeline, image verification is turned off by default, even
    when the command SET VERIFY=IMAGE is executed before the PIPE
    command is entered. This prevents duplication of data records
    going through the pipeline.

    To turn on image verification in a pipeline, an explicit SET
    VERIFY=IMAGE command must precede the pipeline segment command.
    You can use a subshell to do this, as follows:

    $ PIPE ... | (SET VERIFY=IMAGE ; ...)  | ...
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