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if Flow control command |
Usage |
if (<condition>) <command1> [else <command2>] |
Description |
Executes <command1> if the <condition> evaluates
to true (non zero result).
If the else part is given, <command2> is executed
if the <condition> evaluates to false (result == '0'). <condition> is an expression evaluated in the same way as $(*) with the following extensions: If <condition> is a string, its length is evaluated - in this way a non-empty string causes the <condition> to be true, and an empty string causes it to be false. If <condition> is an array, its size is evaluated - a non-empty array is true, an empty array is false. If <condition> is a hash, the number of its entries is evaluated - a non-empty hash is true, an empty hash is false. |
Examples |