According to the the man page, systemd-delta is meant to show differences between files in /usr and /etc. It does however also show snippets created by systemd itself in /run which contradicts this statement and is probably not useful information for the user anyway (v207): [EXTENDED] /run/systemd/system/session-1.scope → /run/systemd/system/session-1.scope.d/90-SendSIGHUP.conf [EXTENDED] /run/systemd/system/session-1.scope → /run/systemd/system/session-1.scope.d/90-TimeoutStopUSec.conf [EXTENDED] /run/systemd/system/session-1.scope → /run/systemd/system/session-1.scope.d/90-KillMode.conf [EXTENDED] /run/systemd/system/session-1.scope → /run/systemd/system/session-1.scope.d/90-After-systemd-user-sessions\x2eservice.conf [EXTENDED] /run/systemd/system/session-1.scope → /run/systemd/system/session-1.scope.d/90-Description.conf [EXTENDED] /run/systemd/system/session-1.scope → /run/systemd/system/session-1.scope.d/90-Slice.conf
Current manpage [1] mentions /run too... systemd-delta cannot really know if the overrides were written by systemd or by the user. If you want to see just the overrides in /etc, you can say 'systemd-delta /etc'. [1] http://www.freedesktop.org/software/systemd/man/systemd-delta.html
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