tldr/linux/journalctl.md

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}}