nixCraft – Linux and Unix tutorials for new and seasoned sysadmin

How to keep Debian Linux patched with latest security updates automatically

June 27, 2017June 27, 2017in Debian / Ubuntu, Linux, Package Management, Security last updated June 27, 2017

How do I keep my server/cloud computer powered by Debian Linux 9.x or 8.x current with the latest security updates automatically? Is there is a tool to update security patched automatically?

How to write Raspbian Jessie image file to SD cards on Apple macOS / OS X

June 27, 2017June 27, 2017in Linux, Mac OS X, Raspberry Pi, UNIX last updated June 27, 2017

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?

How to install latest kernel on CentOS Linux 7 using yum command

June 25, 2017June 25, 2017in CentOS, Linux, Package Management last updated June 25, 2017

I am a new CentOS Linux 7 user who runs it on my Laptop. I liked the operating system. Is there is a way to run latest/stable Linux kernel on a CentOS Linux version 7?

How to display countdown timer in bash shell script running on Linux/Unix

June 24, 2017June 24, 2017in BASH Shell, Linux, UNIX last updated June 24, 2017

I want to display a countdown before purging cache from CDN network. Is there an existing command to show a conuntdown from 30..1 as 30,29,28,…1 on Linux or Unix bash shell script?

How to install and use Monit on Ubuntu/Debian Linux server as process supervision tool

June 24, 2017June 25, 2017in Debian / Ubuntu, Linux, Monitoring, Networking last updated June 25, 2017

How do I install and configure monit to restart services such as Nginx/Apache/OpenVPN server when failed on Debian or Ubuntu Linux?

How to add ZIL write and L2ARC read cache SSD devices in FreeNAS

June 24, 2017in File system, FreeBSD, FreeNAS, UNIX last updated June 24, 2017

How do I add the write cache called the ZIL and read cache called L2ARC to my my zroot volume? How do I extend my existing zroot volume with ZIL and L2ARC ssd disks of FreNSA server?

How to find and delete directory recursively on Linux or Unix-like system

June 20, 2017June 22, 2017in BASH Shell, Linux, UNIX last updated June 22, 2017

I type ‘find . -type d -iname foo -delete‘ command to find the foo directories and delete them. However, I am getting an error message that read as find: cannot delete './hourly.4/data/foo': Directory not empty on Linux server. How do delete directories based on find command output on Linux or Unix-like system?