`expr': Evaluate expressions ============================ `expr' evaluates an expression and writes the result on standard output. Each token of the expression must be a separate argument. Operands are either numbers or strings. `expr' converts anything appearing in an operand position to an integer or a string depending on the operation being applied to it. Strings are not quoted for `expr' itself, though you may need to quote them to protect characters with special meaning to the shell, e.g., spaces. Operators may given as infix symbols or prefix keywords. Parentheses may be used for grouping in the usual manner (you must quote parentheses to avoid the shell evaluating them, however). Exit status: 0 if the expression is neither null nor 0, 1 if the expression is null or 0, 2 for invalid expressions.
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