expr - Evaluate arguments as an expression

Synopsis

expr operand ...

Description

The expr utility evaluates an expression formed by the operands and writes the result to standard output.

Operands

The format of the expression to evaluate is shown as follows. expr, expr1, and expr2 can be decimal integers or strings.

Note:

The six relational expressions return the result of a decimal integer comparison if both arguments are integers. Otherwise, they return the result of a string comparison. The result of each comparison is 1 if the specified relationship is true, or 0 if the relationship is false.

Expression	Description
expr1 \| expr2	Returns the evaluation of expr1 if it is neither null nor zero; otherwise, returns the evaluation of expr2.
expr1 & expr2	Returns the evaluation of expr1 if neither expression evaluates to null or zero; otherwise, returns zero.
expr1 = expr2	Equal.
expr1 > expr2	Greater than.
expr1 >= expr2	Greater than or equal.
expr1 < expr2	Less than.
expr1 <= expr2	Less than or equal.
expr1 != expr2	Not equal.
expr1 + expr2	Addition of decimal integers.
expr1 - expr2	Subtraction of decimal integers.
expr1 * expr2	Multiplication of decimal integers.
expr1 / expr2	Division of decimal integers.
expr1 % expr2	Remainder of decimal integer division.
expr1 : expr2	Matching expression.
( expr )	Grouping symbols.

Exit Status

0 when the expression evaluates to neither null nor zero.
1 when the expression evaluates to null or zero.
2 when the expression is invalid.
>2 when an error occurred.

Examples

Evaluate an arithmetic expression.
```
expr 10+10*10/10-10
```
Evaluate a true or false condition.
```
expr 10 = 10
```