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This is about the Unix utility "test," also invoked as "[", or its shell syntax [[ … ]] variant. For questions about testing software and setups, use the "testing" tag.

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The single bracket [ is actually an alias for the test command, it's not syntax. One of the downsides (of many) of the single bracket is that if one or more of the operands it is trying to …
answered Feb 20 '12 by SiegeX