Bash: Generating configs with envsubst, here document, and here string
In this note, we will briefly look at a few simple ways to build a config from a Bash script using here document, here string, and envsubst.
Shell
All posts under tag "Shell"
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Bash one-liner collection
A regularly updated collection of complex and long shell commands 💻
Bash snippet collection
A regularly updated collection of useful shell snippets 💻.
Bash: Writing a Script to Simulate Mouse Activity
In this short note, we will write a Bash script that moves the mouse pointer one pixel and back at a specified interval. This is useful if your desktop is regularly locked because there is no user activity😉.
How to Learn to Write Bash Scripts: Recommended Materials
In this note, I have put together a small roadmap for those who want to learn programming in the Bash shell language.
A Little About Shebang in Linux
Shebang is the #! sequence at the beginning of an executable file that tells the system which program should interpret this script📝.
Linux command line, archiving and compression: tar, gzip, bzip2, xz, zstd, zip, 7z, and rar commands
In this article, we will study ways to archive and compress files in Linux systems. I will explain how to use the utilities from the article title.
Bash: An Example of Optimizing Filtering Commands with grep and awk
I will tell you about a task I solved the other day🧑💻 I slightly changed the input data, but the essence remains the same. There are two CSV files: 📄ping_status.csv contains diagnostic information about host availability by ping.
Bash: Features of Arithmetic Operations - Increment ((expression++))
When testing the host availability check script I mentioned last time, I encountered an interesting Bash feature when performing arithmetic operations💪.
Bash: Writing a Universal Host Availability Check Script
Today we'll write a useful Bash script🧑💻 that performs various host availability checks on the network🌐. As an example, I'll show how to check connectivity using the `ping` utility🏓 and run a traceroute when it's lost⚡.
flock - Locks in Shell Scripts
In this note, we will talk about file locks in Bash scripts🔒 using the specialized utility flock.
Configuring logging of Bash script output
Many users of Linux🐧 systems face the need to write the output of a particular command/script to a log file📑. In this article we will look at several ways to configure journaling (aka logging) in Linux using the popular command shell — Bash, as an example.
Writing a Function for Quick Access to Complex Commands in Zsh and Bash
In this article we will create a function for the Zsh and Bash shells that allows quick and convenient access to a prepared list of complex, long, and hard-to-remember commands🤯.
bat, exa — Syntax Highlighting for Standard Output in the Linux Terminal (cat, less, tail and ls)
They say that if you read white text on a black background for too long, you start to hear the terminal whisper🙃. In this note we'll talk about how to improve the perception of text from the "black window" by adding syntax highlighting with the command-line utilities bat and exa.
10 minute
Easy
Linux command line, privilege escalation: su, sudo commands
We continue studying the Linux command line. Today we'll learn how to properly run commands on behalf of another user, including the root user.
Writing a bash script to connect to an OpenConnect VPN server
Today we'll write and try out a simple but well-thought-out bash script that performs a client connection to an OpenConnect VPN server, which we covered setting up and running in one of the previous articles.
Linux command line, file permissions: id, chmod, chown commands
Today we'll learn how to manage file permissions in Linux-based systems. In this note we will cover the following commands: id, chmod, chown.
Making functional desktop notifications in Linux: buttons, icons, links
Today I'll show how to create custom functional desktop notifications using the notify-send console utility. Such notifications support active buttons, can display icons, and clickable web links.
ZSH — Interactive Command Shell for Linux + Oh-My-Zsh
Today I'll tell you and show you how to install and configure a great interactive command shell - Zsh. With proper configuration, this shell greatly simplifies working in the command line and makes the process even enjoyable.
Linux command line, processes: jobs, fg, bg, ps, pgrep, kill, pkill, htop commands
Today we'll talk about an important and integral part of an operating system - processes. In this note we will cover the following console commands: jobs, fg, bg, ps, pgrep, kill, pkill, htop.
Linux command line, controlling command execution: the "&&", "||", ";" and "&" operators
Today we're breaking down such powerful Linux command line tools as command execution control operators.
Linux command line, input and output redirection: the ">", "<", "|" operators
Today we will break down one of the key "features" of the Linux command line: the mechanism for redirecting input, output, and error output of console commands.
Linux command line, file links: the ln command
This is the fifth post in the series on the Linux command line. Today we'll talk about file links (hard and symbolic), and also look at the command for creating them: ln.
Linux command line, working with files: touch, mkdir, cp, mv, rm commands
This is the fourth post in a series dedicated to working in the Linux command line. Today we'll look at commands for working with files in Linux: touch, mkdir, cp, mv, rm.
Linux command line, output and reading content: echo, cat, less commands
This is the third post in a series dedicated to working in the Linux command line. Today we'll look at commands for outputting text to the console and viewing file contents: echo, cat, less.
Linux command line, navigating the system and viewing directories: pwd, ls, cd commands
This is the second post in the series devoted to working in the Linux command line. Today we'll look at basic navigation through the file system and viewing directory contents.
Linux command line, introduction: command types, plain text, file system, shell prompt
I present to your attention the first (introductory) part of a series of posts devoted to working in the Linux command line. This post is a kind of foundation for future entries on this topic. It will be followed by posts with descriptions and practical examples of using popular console utilities.