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Logical commands determine whether certain expressions are logically true (returning a 1) or false (returning a 0).
| Command | Description |
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| Returns a logical true if an expression evaluates to non-numeric. |
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| Allows you to return a true or false value based on the Boolean And, Or combination of two expressions. |
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| Determines whether a specified variable has been assigned a value. |
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| Returns the bit-wise And, Or, Xor, and Not of individual bits in an integer value. |
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| Compares a string value to a pattern. Evaluates to 1 (true) or 0 (false). |
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| Inverts the logical value of an expression. |
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| Returns true if an expression evaluates to numeric. |