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What does the MCR command do?

April 26, 2017Command MCR

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What does the MCR command do?

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The MCR is an artifact of RSX compatibility mode, the operating system from which OpenVMS is descended. MCR is the Monitor Console Routine, and the command is intended to activate RSX compatibility mode utilities. When used on OpenVMS, the command is most commonly used to run the specified image and-because the tool detects the image is not a compatibility-mode image- it acts as a form of RUN command with the default file specification of SYS$SYSTEM:.EXE. MCR passes any (optional) command line arguments in a fashion similar to a foreign command. In other words: $ MCR FOO BAR is equivalent to: $ FOO :== $FOO $ FOO BAR MCR is not documented. Use of a foreign command or the DCL$PATH mechanism is preferred. For details on this, see Section 8.2.