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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.
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,
Operators may be 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).
0 if the expression is neither null nor 0, 1 if the expression is null or 0, 2 for invalid expressions.
16.4.1 String expressions + : match substr index length 16.4.2 Numeric expressions + - * / % 16.4.3 Relations for
| & < <= = == != >= > 16.4.4 Examples of using
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