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   systemd.exec    ( 5 )

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SYSTEM V COMPATIBILITY

UtmpIdentifier=
           Takes a four character identifier string for an utmp(5) and
           wtmp entry for this service. This should only be set for
           services such as getty implementations (such as agetty(8))
           where utmp/wtmp entries must be created and cleared before
           and after execution, or for services that shall be executed
           as if they were run by a getty process (see below). If the
           configured string is longer than four characters, it is
           truncated and the terminal four characters are used. This
           setting interprets %I style string replacements. This setting
           is unset by default, i.e. no utmp/wtmp entries are created or
           cleaned up for this service.

       UtmpMode=
           Takes one of "init", "login" or "user". If UtmpIdentifier= is
           set, controls which type of utmp(5)/wtmp entries for this
           service are generated. This setting has no effect unless
           UtmpIdentifier= is set too. If "init" is set, only an
           INIT_PROCESS entry is generated and the invoked process must
           implement a getty-compatible utmp/wtmp logic. If "login" is
           set, first an INIT_PROCESS entry, followed by a LOGIN_PROCESS
           entry is generated. In this case, the invoked process must
           implement a login(1)-compatible utmp/wtmp logic. If "user" is
           set, first an INIT_PROCESS entry, then a LOGIN_PROCESS entry
           and finally a USER_PROCESS entry is generated. In this case,
           the invoked process may be any process that is suitable to be
           run as session leader. Defaults to "init".