# journalctl

> Query the systemd journal

- Show all messages from this boot

`journalctl -b`

- Show all messages from last boot

`journalctl -b -1`

- Follow new messages (like `tail -f` for traditional syslog)

`journalctl -f`

- Show all messages by a specific unit

`journalctl -u {{unit}}`

- Show all messages by a specific process

`journalctl _PID={{pid}}`

- Show all messages by a specific executable

`journalctl {{/path/to/executable}}`