CurrentGroup looks up the current user's group by their primary group id's entry in /etc/passwd.

CurrentUser looks up the current user by their user id in /etc/passwd.

GetAdditionalGroups looks up a list of groups by name or group id against the given /etc/group formatted data.

GetAdditionalGroupsPath is a wrapper around GetAdditionalGroups that opens the groupPath given and gives it as an argument to GetAdditionalGroups.

GetExecUser parses a user specification string (using the passwd and group readers as sources for /etc/passwd and /etc/group data, respectively).

GetExecUserPath is a wrapper for GetExecUser.

LookupGid looks up a group by its group id in /etc/group.

LookupGroup looks up a group by its name in /etc/group.

LookupUid looks up a user by their user id in /etc/passwd.

LookupUser looks up a user by their username in /etc/passwd.

No matching entries found in file.

The current operating system does not provide the required data for user lookups.

IDMap represents an entry in /proc/PID/{u,g}id_map.

SubID represents an entry in /etc/sub{u,g}id.