Systemd

Commands

List all services

systemctl list-units --type=service --all

View journal details

journalctl -xeu <service_name>.service

View service definition

systemctl cat <service_name>.service

View fully loaded service internals

systemctl show termix.service

Show environment in service process

PID=$(pgrep -f termix) && \
sudo cat /proc/$PID/environ | tr '\0' '\n'

`systemd.unit`

systemd.service: A unit configuration file whose name ends in .service encodes information about a process controlled and supervised by systemd.
systemd.automount: A unit configuration file whose name ends in .automount encodes information about a file system automount point controlled and supervised by systemd. Automount units may be used to implement on-demand mounting as well as parallelized mounting of file systems. For each automount unit file a matching mount unit file (see systemd.mount(5) for details) must exist which is activated when the automount path is accessed.
systemd.mount: A unit configuration file whose name ends in .mount encodes information about a file system mount point controlled and supervised by systemd.
systemd.timer: A unit configuration file whose name ends in .timer encodes information about a timer controlled and supervised by systemd, for timer-based activation.
systemd.tmpfiles: systemd-tmpfiles creates, deletes, and cleans up files and directories, using the configuration file format and location specified in tmpfiles.d(5).

Prefix meanings

Type	Path	Mode	User	Group	Age	Argument
f	/file/to/create	mode	user	group	-	content
f+	/file/to/create-or-truncate	mode	user	group	-	content
w	/file/to/write-to	-	-	-	-	content
w+	/file/to/append-to	-	-	-	-	content
d	/directory/to/create-and-clean-up	mode	user	group	cleanup-age	-
D	/directory/to/create-and-remove	mode	user	group	cleanup-age	-
e	/directory/to/clean-up	mode	user	group	cleanup-age	-
v	/subvolume-or-directory/to/create	mode	user	group	cleanup-age	-
q	/subvolume-or-directory/to/create	mode	user	group	cleanup-age	-
Q	/subvolume-or-directory/to/create	mode	user	group	cleanup-age	-
p	/fifo/to/create	mode	user	group	-	-
p+	/fifo/to/[re]create	mode	user	group	-	-
L	/symlink/to/create	-	-	-	-	symlink/target/path
L+	/symlink/to/[re]create	-	-	-	-	symlink/target/path
c	/dev/char-device-to-create	mode	user	group	-	major:minor
c+	/dev/char-device-to-[re]create	mode	user	group	-	major:minor
b	/dev/block-device-to-create	mode	user	group	-	major:minor
b+	/dev/block-device-to-[re]create	mode	user	group	-	major:minor
C	/target/to/create	-	-	-	cleanup-age	/source/to/copy
C+	/target/to/create	-	-	-	cleanup-age	/source/to/copy
x	/path-or-glob/to/ignore/recursively	-	-	-	cleanup-age	-
X	/path-or-glob/to/ignore	-	-	-	cleanup-age	-
r	/path-or-glob/to/remove	-	-	-	-	-
R	/path-or-glob/to/remove/recursively	-	-	-	-	-
z	/path-or-glob/to/adjust/mode	mode	user	group	-	-
Z	/path-or-glob/to/adjust/mode/recursively	mode	user	group	-	-
t	/path-or-glob/to/set/xattrs	-	-	-	-	xattrs
T	/path-or-glob/to/set/xattrs/recursively	-	-	-	-	xattrs
h	/path-or-glob/to/set/attrs	-	-	-	-	file attrs
H	/path-or-glob/to/set/attrs/recursively	-	-	-	-	file attrs
a	/path-or-glob/to/set/acls	-	-	-	-	POSIX ACLs
a+	/path-or-glob/to/append/acls	-	-	-	-	POSIX ACLs
A	/path-or-glob/to/set/acls/recursively	-	-	-	-	POSIX ACLs
A+	/path-or-glob/to/append/acls/recursively	-	-	-	-	POSIX ACLs