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Random man page:
test(1) -- condition evaluation command
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The test command evaluates the expression expr and, if its value is True, returns a zero (true) exit status; otherwise, a nonzero (false) exit status is returned. test also returns a nonzero exit status if there are no arguments. The following primitives are used to construct expr: -r file True if file exists and is readable. -w file True if file exists and is writable. -x file True if file exists... |
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