Misc Oneliners Dump Certs Chain s=""; timeout 2 openssl s_client -servername ${s} -connect ${s}:443 -showcerts > /tmp/${s}.chain selfsigned certificate for 1 year cd /etc/ssl; openssl req -nodes -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 356 set default branch to main git config --global init.defaultBranch main bash - check multiple files [ -f /etc/resolv.conf -a -f /etc/hosts ] && echo "Both files exist" || echo "One or Both Files are missing" remove word ’nosuid’ on the line /var in /etc/fstab sed -E -i.