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In page Bourne shell:

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Duplex Multi-Environment Real-Time (DMERT) is a hybrid time-sharing/real-time operating system developed in the 1970s at Bell Labs Indian Hill location in Naperville, Illinois uses a 1978 snapshot of Bourne Shell "VERSION sys137 DATE 1978 Oct 12 22:39:57".[citation needed] The DMERT shell runs on 3B21D computers still in use in the telecommunications industry.[citation needed]