Command option Sample:systemctl rescue

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systemctl rescue Enter system rescue mode    UCS and systemd - the basics - Supported - Univention Help : http://help.univention.com/t/ucs-and-systemd-the-basics/5559
systemctl rescue 4. e4rat-realloc /var/lib/e4rat/startup.log    e4rat / Tickets / #3 e4rat-0.2.3-r1 - e4rat-realloc gives error and does not seem to do anything : http://sourceforge.net/p/e4rat/tickets/3/
systemctl rescue or    RHCSA systemctl -t vs "list-unit-files" by Erik S : http://linuxacademy.com/community/posts/show/topic/21545-unable-to-boot-into-rescue-mode-using-systemd--rhcsa-test-prep
systemctl rescue will stop e.g. printer.target    Steps to control an errant job ‘µ Issue #838 ‘µ systemd/systemd ‘µ GitHub : http://github.com/systemd/systemd/issues/6505

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https://www.google.com/#q=systemctl rescue