Debian 8 Jessie
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[1] サービスの一覧を表示します。
# 現在起動しているサービスの一覧を表示 (--all を付けると全サービスがリストされる)

systemctl -t service

UNIT                        LOAD   ACTIVE SUB     DESCRIPTION
acpid.service               loaded active running ACPI event daemon
atd.service                 loaded active running Deferred execution scheduler
console-setup.service       loaded active exited  LSB: Set console font and keymap
cron.service                loaded active running Regular background program processing daemon
dbus.service                loaded active running D-Bus System Message Bus
systemd-user-sessions.service      loaded active exited  Permit User Sessions
udev-finish.service                loaded active exited  Copy rules generated while the root was ro

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

35 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# サービスの起動設定の一覧を表示

systemctl list-unit-files -t service

UNIT FILE                  STATE
acpid.service              disabled
atd.service                enabled
autovt@.service            disabled
bootlogd.service           masked
bootlogs.service           masked
urandom.service            static
user@.service              static
x11-common.service         masked

128 unit files listed.
[2] もし自身の環境で不要なサービスがあれば、以下のようにして停止と自動起動のオフ設定をします。以下の例では Atd を停止に設定しています。なお、サービス名末尾の [.service] は省略可能です。
systemctl stop atd

systemctl disable atd