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Instead of using systemctl to manage the netctl-auto service, some users try to invoke the start/stop commands of netctl-auto directly. Although this behaviour is explicitly discouraged in the man page, this seems to be a source of confusion. The changes introduced in de8c80f6 will cause other netctl-auto commands to fail if the netctl-auto service was not spawned by systemd. Therefore, this change emits an error message if netctl-auto [start|stop] is invoked from an interactive terminal.
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