nixCraft Linux & Unix Sysadmin/DevOps Tutorial Newsletter

[nixCraft]

Welcome to nixCraft Linux/Unix newsletter for Wednesday, 18 December 2019. I hope you will enjoy this version of the newsletter.

• killersheep – Silly game for Vim version 8.2 {trending}
  Vim is my favorite text editor and version 8.2 released. The new version includes support for popup windows and text properties. Popup windows can be used for many purposes. For example, a list of choices can be displayed, where the user selects an entry with keys or with the mouse. There is also a new vim game released named as killersheep to show you new capabilities of Vim. Let us see how to install and play killersheep.
   
• CentOS 8 update installed packages for security
  I need to update installed packages for security on CentOS 8.x (CentOS Enterprise Linux) server. How can I update my CentOS 8.x system using yum command?
   
• How to install tar on RHEL/CentOS 6/7/8 using yum
  How can I install and use the tar on a CentOS/RHEL version 8, 7 or 6 desktop using yum command?
   
• How to Install PHP 7.x on CentOS 8 For Nginx
  How do I install PHP 7.x on CentOS 8 Linux server along with Nginx? How can I install the latest version of PHP 7.4 on CentOS Enterprise Linux 8 server?
   
• How to install htop on OpenSUSE Linux using zypper
  I am a new sysadmin of OpenSUSE Linux operating system. How do I install htop on OpenSUSE using the zypper command?
   
• Linux check the physical health of a USB stick [ Flash drive ] {trending}
  How do I check the physical health of a USB stick in Linux operating systems? How do I check USB flash drive in Linux? Can you tell me Linux command to test and detect bad sector in USB flash memory or pen drives?
   
• How to see Time-To-Live (TTL) for a DNS record {trending}
  How do I see Time-To-Live (TTL) for a DNS record using Linux, macOS, *BSD, or Unix-like systems command line option? How do I find my DNS TTL?
   
• How to test and validate DNSSEC using dig command line {trending}
  How do I test and validate DNSSEC using the dig command line under Linux, macOS, *BSD, and Unix-like systems?
   
• How to add bash auto completion in CentOS 8 Linux
  I set up a new cloud server, but my auto-completion of bash shell commands are not working. How do I enable autocomplete feature in CentOS 8 (CentOS Enterprise Linux 8)? How do I write simple bash completion code in CentOS 8?
   
• Add / Create a Sudo User on CentOS Linux 8
  How do I add / create a sudo user on CentOS Linux 8 using the command line?
   
• How to add or mount directory in LXD (Linux container) 
  I have two LXD containers running. One is for Nginx, and another is for processing data. I need to share data between two containers. How do I add or mount a shared directory between two?
   
• Configure Nginx to use TLS 1.2 and 1.3 only {trending}
  How do I enable and configure TLS 1.2 and 1.3 only in Nginx web server?
   
• How to set up a firewall using FirewallD on OpenSUSE Linux {trending}
  I am a new OpenSUSE Linux 15.x sysadmin. How do I set up a firewall using FirwallD on OpenSUSE Linux 15.1?
   
• Linux / Unix Desktop Fun: Christmas Tree For Your Terminal {trending}
  Let us create Linux or Unix console Christmas tree and snow on your Linux desktop just for fun and profit. One can display animated Christmas tree in terminal using either Perl or Bash. First, you need to install a Perl module called Acme::POE::Tree. It is an animated Christmas tree module. I’ve tested this on Linux, OS X and Unix-like system.
   
• Gracefully Restart Nginx Web Server After Changes Made In a Config File
  Iknow how to gracefully restart Apache web server under Unix like operating system. I made changes to nginx.conf. How do I gracefully restart Nginx web server? How do I make changes in a Nginx server config file to take effect without restarting the Nginx server itself without interrupting users’ current session?
   
• How to install and use Nginx on OpenSUSE Linux server
  How do I install and configure the latest version of Nginx web server on OpenSUSE Linux server using the CLI and host a static site?
   
• Understanding /etc/passwd File Format
  Can you explain /etc/passwd file format for Linux and Unix-like operating systems?
   
• Vi / Vim Save And Quit The Editor Command
  I am a new vi / vim text editor user. How do I quit the vi editor and save my changes under a Linux or Unix like operating systems? Can you tell me command to save and quit file in vim?
   
• How To Set up OpenVPN Server In 5 Minutes on Ubuntu Linux {trending}
  I am a new Ubuntu Linux server user. How do I setup an OpenVPN Server on Ubuntu Linux version 14.04, or 16.04/18.04 LTS server to shield my browsing activity from bad guys on public Wi-Fi, and more?
   
• How to set rsync speed limit from eating all bandwidth with –bwlimit option {trending}
  The rsync command is eating all my bandwidth from a backup script and generating tons of I/O. How do I set a limit for file transfer speed of rsync command on Linux or Unix-like system? How can I keep my rsync script from using all of my bandwidth?
   
• BASH Shell Test If a File Is Writable or Not
  How can you test if a file is writable under UNIX / Linux bash shell scripting and programming language?
   
• Python Get Today’s Current Date and Time
  How do I find out the current date and time in Python? What is the module or function I need to use to get current time or date in Python programming language? How can I get today’s date and current date and time in Python in different formats using strftime() method?

Until next time.