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When invoked with no operands, the mdasCollectionHome value in the ~/.srb/.MdasEnv file will become the new working collection.
When the operand collection does not begin with '/', '../', or '^/', the new working collection is changed with respect to current working collection.
When the operand collection begins with '^/' the new working collection is changed with respect to the mdasCollectionHome value in the ~/.srb/.MdasEnv file.
When the operand collection begins with '../' the new working collection is changed with respect to the parent of current working collection.
When the operand collection begins with '/' the new working collection is changed to the operand value.