Vi and Vim Quick References: A One Page Cheat Sheet
A one-page cheat sheet of Vi/Vim quick references to speed-up your productivity with your favorite terminal based text editor. Great for casual Vi and Vim users to daily coders.
View ArticleHow To Use Bash Wildcards for Globbing?
Improve your productivity at the Linux command line and in Bash scripting with globbing by using Wildcards as glob patterns or extended glob expressions.
View ArticleFine tuning a Linux Apache MySQL PHP (LAMP) server
Legacy post discussing how to tune a production system using Linux, Apache, MySQL, and PHP (aka LAMP).
View ArticleHow to Reload or Change your current Shell?
Learn the basic steps to reload your Linux shell to apply your recent configurations changes. This post cover the POSIX exec builtin command in Bash and the GNOME shell.
View ArticleTwo common errors while starting Apache server on Linux
Legacy post discussing some common errors when starting or running an Apache server on Linux.
View ArticleBash Quick References: A One Page Cheat Sheet
A one-page of Bash quick references, aka cheat sheet, to help you script faster and better. Good material from newbies to regular basher.
View ArticleA Quick Guide on How to Use Bash Alias
This post cover the Bash builtin commands alias and unalias. You will often find Bash alias in a customized .bashrc to improve your shell command-line workflow.
View ArticleChoosing a filesystem for your Linux/Unix server
Review of various filesystems available on Linux and how to choose one for your workstation or production server.
View ArticleBind 9.5.0 - Patch dlz MySQL 5 for Auto Reconnect
Legacy post addressing connectivity issue from a Bind 9 server with the dlz MySQL driver to a MySQL 5 backend server. This post provides appropriate patch for the given software versions.
View ArticleHow to flush your DNS Cache on Mac OS X?
Learn how to resolve a bad DNS entry returned by your Mac local cache due to a long TTL DNS and how to purge your Mac OS DNS cache for your specific Mac OS version, all this right from the command line.
View ArticleHow To Generate Sequences of Letters or Numbers?
Learn how to use seq command line and the bash braces expansion to generate sequences of letters or numbers in your shell scripts.
View ArticleUsing losetup and dd to secure sensitive data
Legacy post on using dd and losetup to encrypt a block device and secure sensitive data.
View ArticleMath Arithmetic: How To Do Calculation in Bash?
Learn how to do math arithmetic with integer and floating-point in Bash. Includes addition, subtraction, division, multiplication, and also floating-point precision.
View ArticleLinux sysctl configuration and tuning script
Legacy post providing a custom script to auto-tune your Linux kernel and sysctl options based on your server specifications.
View ArticleDownload files from a Bash Shell
Introduction to the essential function of downloading files directly from a Bash script. This is a common task in any kind of backup/restore automation or in crawling scenarios to retried some kind of...
View Articlesudo: sorry, you must have a tty to run sudo
Learn what is a tty and how to solve 'sudo: sorry, you must have a tty to run sudo' error when using ssh to execute a sudo remote command.
View ArticleRedirecting a stdout to a file using sudo and tee
Learn how to address a permission denied error when trying to edit a file on Linux and work around some sudo issues. This post include a simple vim tips to save changes to a file with sudo right from...
View ArticleDisown a running shell process and reattach it to a new screen
This post cover the basics of shell jobs management and terminal screen sessions. It covers how to detach a running job from your current shell and how to attached it to a new TTY session.
View ArticleHow To Do Advanced Math Calculation Using bc?
Learn how to use the GNU Linux bc command line to do math arithmetic and algebra with square root, sine, cosine, tangent, arctangent, bessel, and more.
View ArticleWhat's New in GNU Bash 5?
Bash version 5 is generally available and comes with some important improvements and new features like BASH_ARGV0, EPOCHSECONDS, and EPOCHREALTIME.
View ArticleHow to Find which macOS version you are running?
Find out which macOS version you are currently running with the use of two command line tools named respectively system_profiler and sw_vers.
View ArticleHow To Upgrade your Bash Version on Mac OS?
MacOS comes with an outdated version Bash which can be limiting in shell scripts. This post explain how to upgrade your Bash version on Mac from the command line.
View ArticleA Complete Guide on How To Use Bash Arrays
This guide covers how to use the bash array variables as indexed or associative bash arrays. Includes how to declare, iterate over, sort, and other array operations.
View ArticleBash Error: Must Use Subscript When Assigning Associative Array
How to solve the Bash Error "must use subscript when assigning associative array". This post covers why it is occurring and how to fix the error when using Bash arrays.
View ArticleHow to Parse a CSV File in Bash?
Learn how to parse a CSV file in Bash and avoid the common pitfalls. Includes examples using bash builtins and the awk command line.
View ArticleRunning Bash script with Ubuntu on Windows 10 using WSL
No-hassle! Learn how to run Bash on Windows by installing your favorite Linux distribution natively on Windows 10 using Windows Subsystem for Linux, aka WSL.
View ArticleHow and When to Use the Dot Command in Bash?
Learn the difference between the dot command (.) and a dot file notation. This post cover how and when you should leverage the dot command to execute a Bash script.
View ArticleWhat's New in Focal Fossa Ubuntu 20.04 LTS?
Ubuntu 20.04 LTS is available for download. Find out some of the major security and performance improvements from this new distribution, including the introduction of WireGuard VPN, upgraded suite of...
View ArticleHow To Change Preferences from the Command Line on macOS?
Introduction to the command line 'defaults' on Mac with examples on how to programmatically change user preferences from a shell script and terminal.
View ArticleHow To Use Option as Meta Key in macOS Terminal?
The Meta Key is a modifier key that can be quite helpful to improve your productivity while working in a terminal and bash. This post cover how to enable from the command line the Meta Key in macOS...
View ArticleHow To Format Date and Time in Linux, macOS, and Bash?
This guide covers how to format date and time in Linux, Mac, and the Bash shell. Includes how to do date shell operations like adding days or comparing dates.
View ArticleWhat is the Bash Null Command?
Learn about the Bash null command, also known as the POSIX shell colon command. This post cover concrete use cases and pitfalls to avoid.
View Articlesudo: no tty present and no askpass program specified
Learn what is askpass and how to solve the 'sudo: no tty present and no askpass program specified' error when using sudo to execute a command.
View ArticleWhat are the Differences Between Vi and Vim?
Vi vs Vim: A review of the main differences between the Vi/Ex POSIX standard and the Vim implementation.
View ArticleHow To Script Error Free Bash If Statement?
Learn how to script a Bash If statement with the then, else, and else if / elif clauses. Includes Bash conditional expressions and common pitfalls to avoid.
View Article5 Mistakes To Avoid For Writing High-Quality Bash Comments
Adding comments in your Bash scripts is necessary to ensure maintainability over time. This post covers 5 Bash comments mistakes to avoid in your shell scripts.
View ArticleWhat is the Best Way to Count Files in a Directory?
Learn how to count the number of files in a directory using the Linux command line ls, find, and a native bash shell solution with globs and arrays.
View ArticleWhat is the Right Way to do Bash Loops?
Looping over a list of numbers or words is a building block in shell scripts. Learn how to write Bash loops, including for loop, while loop, and until loop.
View ArticleHow To Create Simple Menu with the Shell Select Loop?
The select loop is not a regular shell loop. It can be used in Bash to generate a simple menu from which a user can select numbered options.
View Article8 Tips to Get the Most of an Old Windows XP
8 command line tips to get the most value of your old Windows XP, Windows Server 2003, and others.
View ArticleThe Complete How To Guide of Bash Functions
Learn how to write shell scripts with bash functions. This guide includes examples and best practices on how to define, call, and debug functions in bash.
View ArticleThe Most Useful Bash Shortcuts That You Will Want To Use
A detailed review of the most useful Terminal and Bash shortcuts to improve your productivity when typing command-lines and how to customize the ones you don't like.
View ArticleHow To Make A Custom Bash Shell Prompt
Learn how to customize your shell prompt and the specificity of the Bash Prompt variables PROMPT_COMMAND, PROMPT_DIRTRIM, PS0, PS1, PS2, PS3, and PS4.
View ArticleA Complete Guide to the Bash Environment Variables
A complete guide on the Linux Bash environment variables with details on how to set, unset, and use the specials shell variables or define custom environment variables.
View Article5 Simple Steps On How To Debug a Bash Shell Script
Learn how to quickly debug scripts in Bash with those 5 simple steps that use some of the Bash shell special properties.
View ArticleHow to use Microsoft PowerShell to boost your tasks automation journey
Introduction to tasks automation with Microsoft PowerShell and PowerShell Core. Learn some essentials cmdlet and how to create and execute PowerShell scripts.
View ArticleTop 10 Bash Pitfalls You Don't Want to Make
This blog post provides an informative guide to common pitfalls in GNU Bash shell and offers practical tips and solutions for avoiding or resolving them.
View ArticleHow to Master String Pattern Matching using Bash Character Classes
Exploring the power of GNU bash character classes for efficient pattern matching in regular expressions, with an example script to generate an ASCII table.
View ArticleUnderstanding Common Error Messages
Learn about various error messages that are specific to the Bash shell on Linux, along with illustrative examples of scripts that might produce these errors, and how to resolve them.
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