_Added in 1.8.10_ *$false* Returns $false, mainly used for [[/if]], [[/while]] expressions. *Example*
if ($true) {
  echo -ag expression was true
}

if (!$true) {
  echo -ag expression was false
}

if ($false) {
  echo -ag expression was false
}

if (!$false) {
  echo -ag expression was true
}