/etc/systemd/system
Directories:

• /etc/systemd/system/timers.target.wants
• /etc/systemd/system/sysinit.target.wants
• /etc/systemd/system/sockets.target.wants
• /etc/systemd/system/network-online.target.wants
• /etc/systemd/system/getty.target.wants
• /etc/systemd
• /etc/systemd/system/multi-user.target.wants
• /etc/systemd/system/proftpd.service.d

Files:

• sshd.service
• syslog.service
• mysqld.service
• mysql.service
• dbus-org.freedesktop.timesync1.service