• Full docs: official docs
• IN ADDITION TO ANYTHING IN /var/log!!
• journalctl -b # everything since boot
• journalctl -u UNITNAME
• journalctl --no-pager ## do not pause after each page
• journalctl _PID=12345 ## check specific pid
• journalctl /usr/bin/bash
• also used for management: --vacuum-size, --vacuum-time
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