ow do I change the hostname of a Debian Linux 10 “Buster” operating system permanently using the command line tools?
have Debian 9.x installed on AWS EC2. How do I upgrade Debian 9 Stretch to Debian 10 Buster using the apt command
CLI? How can I upgrade Debian 9 to Debian 10 using ssh client?
am trying to delete a directory in Linux using the rmdir dir1
command. But, I am getting an error that read as follows: rmdir: failed to remove `dir1': Directory not empty
How do I force remove and delete a directory in Linux?
am a new Linux system admin. How do I obtain the number of CPUs and cores in the Linux system from the command line? How do I determine the number of CPUs on Linux?
do not wish to use Google Authenticator or Authy app that generates 2 step verification (2FA) codes on my iOS/Android phone. Is there any way I can produce 2FA codes from Linux command line for popular sites such as Gmail, Twitter, Facebook, Amazon and more?
an you explain bash exit status code? How do I set bash exit status in my Linux shell scripts?
installed OpenVPN VPN solutions on Ubuntu for my businesses to secure all data communications. I also set up Pin-hole ad blocker on Ubuntu server along with OpenVPN. How do I force Pi-hole to use Cloudflare DNS over HTTPS (DoH) to increase my privacy and security by preventing eavesdropping and manipulation of DNS data by man-in-the-middle attacks?