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# systemd
## systemctl
Inspect units:
```text
systemctl [opts] [cmd]
[opts]
--user
[cmd]
list-units <pattern> List units in memory
status <unit> Show runtime status of unit
start <unit> Start a unit
stop <unit> Stop a unit
restart <unit> Restart a unit
reload <unit> Reload a unit
enable <unit> Enable a unit (persistent)
disable <unit> Disable a unit
cat <unit> Print unit file
show <unit> Show properties of unit
```
### Example: Trivial user unit
```bash
# Generate unit
mkdir -p ~/.config/systemd/user
echo '[Unit]
Description=Test logger
[Service]
Type=oneshot
ExecStart=logger "Hello from test unit"' > ~/.config/systemd/user/test.service
# Run unit
systemctl --user start test
# See log message
journalctl --user -u test -n 5
```
## journalctl
Inspect journal logs:
```text
journalctl [opts] [matches]
--user Current user journal (system by default)
-u <unit> Show logs for specified <unit>
-n <lines> Show only last <lines>
-f Follow journal
-g <pattern> Grep for <pattern>
```
Cleanup:
```text
journalctl [opts]
--disk-usage Show current disk usage
--vacuum-size=<size> Reduce journal log to <size> (K/M/G)
```
## References
- [man systemd.unit(5)](https://www.man7.org/linux/man-pages/man5/systemd.unit.5.html)
- [man systemd.service(5)](https://www.man7.org/linux/man-pages/man5/systemd.service.5.html)
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