VMS Help  —  DSR  DSR Commands, Conditional Commands
    The .IF, .IF NOT, .ELSE, and .ENDIF commands (also known as
    the conditional commands) cause portions of a DSR file to be
    processed or not processed, according to conditions that you
    specify. The commands refer to the /VARIANT qualifier that you
    specify on the DSR command line. (See also /DEBUG=CONDITIONALS
    and .VARIABLE.)

    Formats

      .IF  name

      .ELSE  name

      .IFNOT  name (or .IN name)

      .ENDIF  name (or .EI name)
Additional Information: explode extract
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