<refsect1>
<title>Environment</title>
+ <para>The environment block for the system manager is initially set by the kernel. (In particular,
+ <literal>key=value</literal> assignments on the kernel command line are returned into environment
+ variables for PID 1). For the user manager, the system manager sets the environment as described in the
+ "Environment Variables in Spawned Processes" section of
+ <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
+ <varname>DefaultEnvironment=</varname> setting in the system manager applies to all services including
+ <filename>user@.service</filename>. Additional entries may be configured (as for any other service)
+ through the <varname>Environment=</varname> and <varname>EnvironmentFile=</varname> settings for
+ <filename>user@.service</filename> (see
+ <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>). Also,
+ additional environment variables may be set through the <varname>ManagerEnvironment=</varname> setting in
+ <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ and
+ <citerefentry><refentrytitle>systemd-user.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ </para>
+
+ <para>Some of the variables understood by <command>systemd</command>:</para>
+
<variablelist class='environment-variables'>
<varlistentry>
<term><varname>$SYSTEMD_LOG_COLOR</varname></term>
only the options described below are understood. Nevertheless, <command>systemd</command> is usually
started in this mode through the
<citerefentry><refentrytitle>user@.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- service, which is shared between all users, and it may be more convenient to use configuration files to
+ service, which is shared between all users. It may be more convenient to use configuration files to
modify settings (see
<citerefentry><refentrytitle>systemd-user.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>),
- or a drop-in that specifies one of the environment variables listed above in the Environment section
- (see the discussion of <varname>Environment=</varname> and <varname>EnvironmentFile=</varname> in
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>).</para>
+ or environment variables. See the "Environment" section above for a discussion of how the environment
+ block is set.</para>
<variablelist>
<varlistentry>