In Bash scripting, conditional statements like “if” allow you to execute code based on a given condition. However, there are often cases where you need to check multiple conditions at once, and this is where the AND operator comes in handy. Understanding how to use the AND operator in Bash can make your scripts more powerful and efficient. This article will discuss how to use the AND operator with if statements in Bash and explore various options available for achieving this.
Programming & Scripting
Try-Catch in Bash: Bash Script Error Handling
Bash scripting is a powerful tool for automating tasks on Linux systems. However, unlike high-level programming languages, Bash doesn’t have built-in try-catch blocks for error handling. Instead, you must implement different strategies to detect and manage errors during script execution. In this article, we will explore five methods for handling errors in Bash scripts, ranging from beginner-friendly to more advanced approaches.
Sed Substitute Command: Basics, Backreferences, and File Editing
Sed stands for “Stream EDitor”: it is a free and open source utility installed by default on all Linux and Unix-based operating systems out there. What it does, is performing text manipulation on files, but it can also be used as part of pipeline and supports the use of regular expressions. In this tutorial, we learn the basics of the sed substitute command.
How to create a hot standby with PostgreSQL
With databases such as PostgreSQL, the need may arise to scale and provide high availability. If the database does not have a backup which can take its place in case of failure, then all of your operations that depend on the database can be affected from just a single point of failure. Even with virtual systems, there may be a time when you can’t add more resources to a single machine to cope with the ever-increasing load.
How to Store All Shell Commands Immediately After Execution into .bash_history File
When working with the Linux command line, the .bash_history file plays a vital role by storing the commands you have executed. By default, the commands are stored only when you exit your terminal session, meaning they might not be saved in real-time. However, it can be beneficial to ensure that all commands are saved to the .bash_history file immediately after execution. This can be particularly useful in environments where you need to keep track of commands for auditing purposes or if you want to ensure no commands are lost if the terminal unexpectedly closes. In this article, we’ll walk you through the steps to achieve this behavior in your bash shell.
How to install the Zed code editor on Linux
Zed is a high-performance, “multiplayer”, free and open source code editor written in Rust and developed in the open on GitHub. It was created by the same authors as the Atom text editor, and although it has IDE features, it is very responsive. In this tutorial, we learn how to install Zed on some of the most used Linux distributions.
Example of C++ class template Array to instantiate an Array of any element type
In this article, we will discuss how to use C++ class templates to create an array that can handle any element type. This allows for more flexible and reusable code by using templates to define generic classes.
Bash Scripting: Understanding the Use of Parentheses, Brackets, and Braces
In this tutorial, we will explore the various uses of parentheses, brackets, and braces in BASH scripting. These symbols have distinct functionalities and are crucial for writing effective scripts. Understanding their uses can help you in tasks such as arithmetic operations, test constructs, and parameter expansions.
Using sed and Bash to Fill Empty Cells in a CSV File
Dealing with CSV files containing empty cells can be challenging, especially when trying to process or analyze data programmatically. In this article, we will explore how to use Bash and the powerful text stream editor sed to fill these empty cells efficiently. This approach ensures that your data is complete and ready for further manipulation or analysis.
How to count number of columns in CSV file using bash shell
Counting the number of columns in a CSV file is a common task that can be easily accomplished using various tools available in the Bash shell. In this article, we will explore five different methods to achieve this. Each method will utilize different command-line tools and techniques, giving you a comprehensive understanding of how to handle CSV files in a Bash environment.
Exit code 127 error status in Bash script
Are you receiving a exit code 127 error when trying to execute a Bash script? This means that your Linux system was not able to find the command referenced inside of the script, which could indicate that the path to the command is not valid, or the command is not installed at all. In this tutorial, we’ll explain what causes this “command not found” error and show you how to fix it.
How to Use a Bash Script to Run Your Python Scripts
Python is a popular programming language used in a wide range of applications, from data analysis and scientific computing to web development and artificial intelligence. Bash is a powerful scripting language used primarily in Unix and Linux environments for automating tasks and running commands. By combining the two languages, developers can create powerful scripts that can automate complex tasks and workflows.