TLDR Search

Enter a command. For example: faketime, uprecords, apt mark.

journalctl

Query the systemd journal. More information: https://manned.org/journalctl.

• Show all messages with priority level 3 (errors) from this [b]oot:
   
  journalctl -b --priority={{3}}
   
• Show all messages from last [b]oot:
   
  journalctl -b -1
   
• Delete journal logs which are older than 2 days:
   
  journalctl --vacuum-time={{2d}}
   
• [f]ollow new messages (like tail -f for traditional syslog):
   
  journalctl -f
   
• Show all messages by a specific [u]nit:
   
  journalctl -u {{unit}}
   
• Filter messages within a time range (either timestamp or placeholders like "yesterday"):
   
  journalctl --since {{now|today|yesterday|tomorrow}} --until {{YYYY-MM-DD HH:MM:SS}}
   
• Show all messages by a specific process:
   
  journalctl _PID={{pid}}
   
• Show all messages by a specific executable:
   
  journalctl {{path/to/executable}}