System.Posix.User
getRealUserID
getRealGroupID
getEffectiveUserID
getEffectiveGroupID
getGroups
getLoginName
getEffectiveUserName
data GroupEntry
getGroupEntryForID
getGroupEntryForName
getAllGroupEntries
data UserEntry
getUserEntryForID
getUserEntryForName
getAllUserEntries
setUserID
setGroupID
setEffectiveUserID
setEffectiveGroupID
setGroups