Arithmetic evaluation (command)

(( <EXPRESSION> ))

This command evaluates the arithmetic expression <EXPRESSION>.

If the expression evaluates to 0 then the exit code of the expression is set to 1 (FALSE). If the expression evaluates to something else than 0, then the exit code of the expression is set to 0 (TRUE). For this return code mapping, please see this section.

The functionality basically is equivalent to what the ''let'' builtin command does. The arithmetic evaluation compound command should be preferred.

• Internal: arithmetic expressions
• Internal: arithmetic expansion
• Internal: The ''let'' builtin command