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Shell script to set up an LXD (Linux Containers) VM lab for testing purpose

A sample shell script to build an LXD (Linux Containers) VM lab on Ubuntu Linux 16.04 LTS server.

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Shell script to mirror backups to another server in pull mode using rsync

A sample shell script to mirror remote server directory in pull mode for offsite backups using rsync command on Linux/Unix-like system.

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Linux/Unix bash shell script to purge Cloudflare url/images from the command line

Here is a simple and easy to use bash shell script to purge/delete Cloudflare url/images cache from the command line without using web interface.

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How to find Intel NUC BIOS version and model on Linux

I installed Linux on Intel NUC. I need to find Intel NUC BIOS version. How do I find out BIOS version, date, and model name of my Intel NUC using Linux command-line options?

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Install Google Chrome 73 on CentOS 7 using yum command

I am a new CentOS Linux 7 desktop user. How do I install Google Chrome 72 on CentOS 7 Linux desktop?

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Ubuntu Enable & Set up Automatic Unattended Security Updates

I have minimal Ubuntu Linux 18.04 LTS server setup in the cloud. I read that one can configure Ubuntu Linux to download and install security updates when released automatically. How can I set up automatic security updates on Ubuntu Linux 18.04 or 16.04 LTS system?

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Linux hide processes from other users and ps command

How can I stop leaking process information to all users on Linux operating systems? How do I prevent users from seeing processes that do not belong to them on a Debian/Ubuntu/RHEL/CentOS Linux server? Is there any way to hide other users process when running ps command?

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Understanding Bash fork() Bomb :(){ :|:& };: code

Can you explain the following bash code or bash fork() bomb code?

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vim-plug: A beautiful and minimalist vim plugin manager for Linux/Unix users

A vim plugin manager is a must for any die-hard vim user. You can find a few option available out there. My personal favorite is vim-plug which is a beautiful and minimalist plugin for vim. Let us see how to install and use this plugin on Linux or Unix-like system.

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How to override content type with Nginx web server

I configured Nginx server. However, it is sending the wrong content type. I need to force Nginx to send specific "Content-Type: text/xml; charset=UTF-8". How do I configure Nginx to override content type for given URL location?

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How to install networked HP printer and scanner on Fedora Linux

I have HP Officejet Pro printer and scanner. How do I install HP Officejet Pro network printers and scanners on Fedora Linux? How can I install HP printer on Fedora Linux? How do I add a HP network printer on Fedora Linux?

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OpenBSD install MariaDB database server

How do I install MariaDB database servers on OpenBSD Unix operating systems?

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Linux / UNIX: Bash Script Sleep or Delay a Specified Amount of Time

How do I pause for 5 seconds or 2 minutes in my bash shell script on a Linux or Unix-like systems?

The post Linux / UNIX: Bash Script Sleep or Delay a Specified Amount of Time appeared first on nixCraft.

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KSH redirect stdout and stderr to a file on Linux or Unix

I am working with KSH script on Unix operating system. How do I redirect error messages in Unix when using KSH? How can I redirect stdout and stderr with KSH on Linux or Unix-like systems?

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How to install FFmpeg on Fedora Linux 28/29 using dnf

When I type ffmpeg -i input output.mp4 on Fedora Linux, I get an error: "bash: ffmpeg: command not found...". How do I install ffmpeg on Fedora Linux 28 or 29 workstations?

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Linux / Unix Find Command Avoid Permission Denied Messages

When I type find . -type d -name 'foo' command I get Permission denied error messages. How do I exclude all 'permission denied:' messages from the find command under Linux or Unix like operating systems?

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How to install VirtualBox 6 on Fedora Linux 29

I am a new Fedora Linux user. How can I download and install Oracle VirtualBox 6 on my Fedora Linux 29 workstations?

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How to install Ansible on Fedora 29 for IT and server automation

How do I install Ansible on Fedora 29 workstation? How can I set up and test Ansible playbooks using my Fedora Linux desktop?

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How to install Shutter screenshot tool on a Fedora Linux

How do I install shutter screenshot tool to make screenshots on a Fedora Linux 29 workstations?

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Install Chromium browser in Fedora 29 using dnf command

I am a new Fedora Linux user. I need to install and set up Chromium for testing purpose. How do I install Chromium browser in my Fedora Linux workstation?

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Nginx Redirect HTTP To HTTPS with Rewrite 301 Rules

{Updated}I have setup nginx as a secure reverse proxy server. How do I redirect all http://example.com/ requests (traffic) to https://example.com/ under nginx web server? How do I configure Nginx to redirect HTTP To HTTPS?

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Linux/Unix desktop fun: Simulates the display from 'The Matrix'

The Matrix is a science fiction action movie from 1999. It was written and directed by the Wachowski Brothers. The film has falling green characters on screen. The digital rain is representing the activity of the virtual reality in 'The Matrix.' You can now have Matrix digital rain with CMatrix on a Linux or Unix terminal too.

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How to create snapshots with lxc command for LXD

I need to save the state of my existing app running on LXD before I push new Python-based app. How do I create snapshots with lxc command for LXD based Linux container?

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How to set and use sudo password for Ansible Vault

How can I set a sudo password for Ansible from the Linux or Unix cli? How can I store sudo password in a vault file and use it securely without exposing my details?

The post How to set and use sudo password for Ansible Vault appeared first on nixCraft.

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How to hide files and directories in Linux

I am a new Linux user. How do I hide files and directories in Linux operating systems using the command line interface?

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How to change directory in Linux terminal

{recently updated}My Dell Laptop came preinstalled with Ubuntu Linux, and I am a new Linux desktop user. How do I change directories in the Linux terminal?

The post How to change directory in Linux terminal appeared first on nixCraft.

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Linux / UNIX List Just Directories Or Directory Names

How do I list just directory names on a Linux and UNIX-like operating systems? How can I list directories only in Linux?

The post Linux / UNIX List Just Directories Or Directory Names appeared first on nixCraft.

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Firefox is now placing ads and here is how to disable it

Firefox user discovered that Mozilla Firefox is displaying ads on the home or new tab page. When you open Firefox on your desktop, an advertisement banner at the bottom page displayed. The advertisement read as follows:

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2018: Top 10 biggest news stories from Linux and open source world

The year 2018 turn out to be big newsmaker for Linux and open source world. The most important acquisition in the open source world, Deepfakes, important security flows in CPUs, and the Facebook scandal all happened in 2018. Vivek Gite picks top 10 most significant and biggest news stories from Linux and open source world that rock IT world.

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How to check running process in Ubuntu Linux using command line

I am a new Ubuntu sysadmin for the Ubuntu Linux operating system. How do I check running process in Ubuntu Linux using the command line option?

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Show All Running Processes in Linux using ps/htop commands

{recently updated}How do I see all running process in Linux operating systems using command line or GUI options? How can I show all running Processes in Linux operating system?

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Linux Add User To Group Using Command-Line

{Updated} How can I add a user to a group under Linux operating system using command line options? How to add an existing user into a group in Linux using command-line options?

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Linux incrond inotify Monitor Directories For Changes And Take Action

{recently updated}This page shows how to set up incrond and sync files between two web server nodes.

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19 Ubuntu / Debian Linux apt Command Examples

{Updated}apt command guide for new Linux users/sysadmins/developers that works on a Debian, Ubuntu and other apt based distros

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Bash shell find out if a variable has NULL value OR not

I am a new to shell scripting. How do I check for NULL value in a Linux or Unix shell scripts?

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Linux Find Out BIOS Version Using a Command Line Option

{Updated} How do I find out BIOS version using a Linux command line option? How do I check the motherboard BIOS version using Linux command line option?

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How to show recursive directory listing on Linux or Unix

I am a new Linux system user. How do I see a recursive directory listing on macOS Unix system? In Linux, how can I get a recursive directory listing?

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Linux / Unix Desktop Fun: Christmas Tree For Your Terminal

{Updated} Let us create Linux or Unix console Christmas tree and snow on your Linux desktop just for fun and profit.

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How to view Linux kernel parameters for currently booted system

How do I display or view Linux kernel parameters for currently running/booted kernel? How can I see Linux kernel command line parameters?

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Linux ip Command Examples For Sysadmins and Developers

{Updated} The ifconfig command on Linux officially deprecated for some time. It is time to move on and learn the ip command. Let's see how to display, configure IP addresses, routing, links, and more associated with network interfaces on Linux using the ip command.

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Linux Shell - How To Remove Duplicate Text Lines

I need to sort data from a log file, but there are too many duplicate lines. How do I remove all duplicate lines from a text file under GNU/Linux?

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sudo: Sorry, you must have a tty to run sudo Error on a Linux and Unix

I am getting an error that read as 'sudo: sorry, you must have a tty to run sudo'. How do I fix this problem on Linux or Unix based systems?

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How to ignore invalid and self signed ssl connection errors with curl

I wanted to curl command to ignore SSL certification warning. How do I force the curl command to ignore all invalid and self singed ssl connection errors?

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Empty or Delete a log files in Linux or UNIX

My web server's log file size is quite huge or large. How do I delete a log file in Linux without distributing running application? Is there a proper way to clear log files on Unix?

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How to change root password on macOS Unix using terminal

I am a new user of macOS Unix running on MacBook Pro and Mac mini server. I need to change the password for root user account on macOS. How do I change the root password on macOS Unix using command line options?

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How do I know if my Linux is 32 bit or 64 bit?

I need to find out if my Linux server is running on 32-bit or 64-bit system. How do I know if my Linux is 32 bit or 64 bit?

The post How do I know if my Linux is 32 bit or 64 bit? appeared first on nixCraft.

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Display Linux logo with hardware Info using screenfetch / linux_logo

Do you want to display a super cool logo of your Linux distribution along with basic hardware information? Look no further try awesome screenfetch and linux_logo utilities.

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FreeBSD wget cannot verify certificate, issued by Let’s Encrypt

I installed GNU wget utility on FreeBSD as explained here. However, whenever I use the wget command to download stuff from the Internet, it says:
   ERROR: cannot verify download.freebsd.org's certificate, issued by 'CN=Let\'s Encrypt Authority X3,O=Let\'s Encrypt,C=US':
    Unable to locally verify the issuer's authority.
How do I fix this problem on FreeBSD 12?

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How to update LXD container Ubuntu image from 16.04 to 18.04

I run my app inside Ubuntu Linux 16.04 LTS lxd Linux container. To upgrade Ubuntu 16.04 to 18.04 LTS container, I run do-release-upgrade command, but I am getting the error message that read as "Must be connected to a terminal." How do I fix this problem to upgrade from Ubuntu Linux 16.04 to 18.04 image?

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