`journalctl`

5 commands

Delete old journal logs
Caution
```
sudo journalctl --vacuum-time=2d
```
Removes archived journal files older than the given age to free disk space.
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Follow the logs of a service
```
journalctl -u service -f
```
Shows the latest log entries of the service and keeps streaming new ones as they are written.
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Follow the system log
```
journalctl -n 100 -f
```
Prints the most recent log lines and keeps streaming new entries as they arrive.
- logs
- systemd
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Show errors from the previous boot
```
journalctl -b -1 -p err
```
Lists messages of priority error or worse logged during the boot before the current one.
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Show logs within a time range
```
journalctl --since "1 hour ago" --until "now"
```
Prints log entries written between the two times, which accept dates or phrases like yesterday or 1 hour ago.
- logs
- systemd
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