ow do I monitor disk I/O latency in real time on Linux, FreeBSD, OpenBSD, and MacOS operating system?
alware is becoming more and more common for macOS. I wanted to make sure file I downloaded files such as an ISO image or firmware are safe before install on my system. How do I verify md5 or sha1 or sha256 checksums for my Apple MacOS X when I download files from the Internet?
I got a Raspberry PI 3 from my friend. I am a long term macOS user. How do I write Raspbian image file to SD card using macOS?
recently ran a command ‘sed -i 's/CONFIG_1/CONFIG_OPT_2/g' /etc/nginx/sites-enabled/*.conf
‘ on a Debian Linux server. However, the sed command destroyed the link and created a regular file in place of the link file. How can I prevent my ‘sed -i’ command from destroying symlinks on Linux or Unix-like system?
ow do I use Ansible to upload ssh public key to as authorized_key to multiple Linux or Unix servers saved in an inventory file?
I think Google has its own dns caching system. I am getting the same old dns entry in my Google Chrome browser on both Linux and Apple OS X. How do I flush or clear the DNS cache in Google Chrome browser without compete shutting down?
need to run a Linux command over 20 servers using a root user and password in Ansible too. How do I pass a user and password in Ansible over ssh based session? How can I set a default Ansible username/password for ssh connection?