Watch command output linux
Re-run a command every 2 seconds with diff highlighting
watch -n 2 'kubectl get pods -n <ns>'
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Run command in background
nohup ./script.sh > /tmp/out.log 2>&1 &
Create SSH tunnel
ssh -L 8080:internal-service:80 user@bastion -N -f
Extract tar.gz
tar -xzf archive.tar.gz -C /target/dir/
Generate random password
openssl rand -base64 32
Check certificate details
openssl s_client -connect example.com:443 </dev/null 2>/dev/null | openssl x509 -noout -dates -subject