Export journald to JSON linux
Structured log export for ingestion into log aggregators
journalctl -u <service> -o json | jq '{ts: .REALTIME_TIMESTAMP, msg: .MESSAGE}'
more linux
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Show NTP sync status
timedatectl status && chronyc tracking
Check systemd timers
systemctl list-timers --all --no-pager
Copy SSH public key
ssh-copy-id -i ~/.ssh/id_ed25519.pub user@host
Rsync with progress
rsync -avz --progress --delete src/ user@host:/dest/
Securely wipe a disk
shred -vzn 1 /dev/sdb