test
Evaluates an expression
test expression
[ expression ]
The test utility evaluates an expression and returns a condition code indicating that the expression is either true (0) or false (not 0). You can use brackets ([]) around the expression instead of using the word test (second format).
Arguments
The expression contains one or more criteria (see the following list) that test evaluates. A -a separating two criteria is a Boolean AND operator: Both criteria must be true for test to return a condition code of true. A -o is a Boolean OR operator. When -o separates two criteria, one or the other (or both) of the criteria must be true in order for test to return a condition code of true.
You can negate any criterion by preceding it with an exclamation ...
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