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test ” evaluates an expressiontest evaluates an expression and returns an exit status indicating that the expression is either true (0) or false (not zero). Used primarily by Bourne and Korn shell for string, numeric, and file testing. The C shell has most of the tests built-in. Example A.60.1 test 5 gt 6 2 echo $? ( Bourne and Korn shells) (Output is 1, meaning the result of the test is not true.) EXPLANATION
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