xor

The boolean 'xor' function returns true if one, and only one, of its two boolean arguments are true.

bool xor <bool:arg1> <bool:arg2>

True if:

• arg1 is true and arg2 is false, or;
• arg2 is true and arg1 is false.

False otherwise.

echo <zs:xor false false> // should be false
echo <zs:xor false true> // should be true
echo <zs:xor true false> // should be true
echo <zs:xor true true> // should be false

… the output of which is written to the event log by echo as:

false
true
true
false

None.

• not
• or
• and