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DCL Symbols and OpenVMS Logical Names?

April 26, 2017DCL names OpenVMS Symbols

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DCL Symbols and OpenVMS Logical Names?

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DCL symbols are programming-style variables implemented within the DCL command interpreter, and these are used both for programming and to provide command verb synonyms. Symbols are local to the command interpreter operating within a particular process, and are not shared. Lists of symbols can be copied into subprocesses during a subprocess creation operation, but these symbols are neither copied back into the parent process when the subprocess exits, nor are symbols ever shared across processes. Symbols can be specified in and utilized in basic mathematical operations, and bit-level operations are available with the f$cvsi and f$cvui bit extraction lexical functions, and with the square-brackets notation for bit insertion (see Section 8.13 for an example), and with bitwise operators. Symbols are of two basic types, STRING and INTEGER, and these (or an undefined symbol) can be differentiated with the f$type lexical function. DCL symbols can also be used as a mechanism to abbreviate a D