-eq
is equal to
-ne
is not equal to
-gt
is greater than
-ge
is greater than or equal to
-lt
is less than
-le
is less than or equal to
<
is less than (within double parenthese) (($a < $b))
<=
is less than or equal to
>
is greater than
>=
is greater than or equal to
-z
string is null, that is, has zero length
-n
string is not null
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