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25 lines
1004 B
Plaintext
25 lines
1004 B
Plaintext
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====== Arithmetic evaluation (command) ======
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===== Synopsis =====
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<code>
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(( <EXPRESSION> ))
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</code>
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===== Description =====
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This command evaluates the [[syntax:arith_expr | arithmetic expression]] ''<EXPRESSION>''.
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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 [[syntax:arith_expr#arithmetic_expressions_and_return_codes | this section]].
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The functionality basically is equivalent to what the [[commands:builtin:let | ''let'' builtin command]] does. The arithmetic evaluation compound command should be preferred.
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===== Examples =====
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===== Portability considerations =====
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===== See also =====
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* Internal: [[syntax:arith_expr | arithmetic expressions]]
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* Internal: [[syntax:expansion:arith | arithmetic expansion]]
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* Internal: [[commands:builtin:let | The ''let'' builtin command]]
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