Show NTP sync status linux
Clock sync state, offset, and NTP source details
timedatectl status && chronyc tracking
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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
Check SMART disk health
smartctl -a /dev/sda | grep -E 'SMART overall|Reallocated|Pending|Uncorrectable'