Fun corollary to this, having an empty element in your $PATH (for example, "/foo::/bar") is the same as having '.' in your $PATH, at least under bash. This wil

Fun corollary to this, having an empty element in your $PATH (for example, "/foo::/bar") is the same as having '.' in your $PATH, at least under bash. This will usually happen when a login script puts the value of a variable in your $PATH without actually checking whether that variable has any contents.