Writing Your First Script Writing your first script is where most beginners either build real confidence or get stuck for good. Most people can copy a bash command from a tutorial, but very few can sit down and write a working script from a blank file, and interviewers know this gap exists. This part covers […]
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⛶ × Perl has been part of Linux and Unix administration for decades, and it is still used for text processing, log analysis, reporting, and system automation. For shell users, the main advantage is simple: Perl can handle tasks that become difficult to maintain when a Bash script grows into a long chain of grep, […]
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⛶ × Linux PAM (Pluggable Authentication Modules) is one of the most important parts of a Linux system. It controls how users are authenticated when they log in through SSH, use sudo, switch users with su, or access other PAM-enabled services. A small mistake in a PAM configuration file can prevent users from logging in, […]
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⛶ × Every DevOps engineer knows the feeling of being interrupted by unexpected alerts, failed deployments, or production incidents. Investigating logs, identifying the root cause, and applying a fix can consume valuable time. AI agents are changing that workflow by continuously monitoring infrastructure, analyzing issues, recommending solutions, and even automating remediation tasks. In this guide, […]
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What Is Required to Set Up a Shell Scripting Environment Shell scripting environment setup is the foundation every Linux beginner needs to master before writing production scripts. A proper shell scripting environment setup requires understanding which shell to use, how to create executable scripts with the correct shebang line, and what tools are essential for […]
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⛶ × Building bash reporting scripts is one of the most practical uses of Bash in Linux administration. Whether you need daily system health reports, storage utilization summaries, backup verification reports, or operational status updates, Bash can automate the entire workflow with minimal overhead. Instead of manually collecting information from multiple commands, you can create […]
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What Is the Bash Command Hierarchy and How Does PATH Work in Linux) A common Linux interview question is: "What happens when you type a command and press Enter?" Despite sounding simple, it often reveals gaps in understanding that can cause real-world troubleshooting problems later on. Consider a situation where a script runs the ls […]
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I once had a cron job that quietly failed for three weeks straight because the script's bash logging xml parsing setup just printed to a terminal that nobody was watching. By the time anyone noticed, we had no record of what went wrong or when it started. That single missing habit, writing logs that actually […]
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× Wildcards and globbing in Linux are among the most commonly used shell features, yet many users rely on them without fully understanding how they work. A simple pattern such as * or ? can save time when managing files, but it can also produce unexpected results if used incorrectly. This guide explains how wildcard […]
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What is Bash & Why It Matters in Linux Bash scripting interview questions challenge more Linux candidates than almost any other topic, not because the concepts are complex, but because most people never practice explaining them clearly. It's not about memorizing commands or syntax. It's about answering simple questions with confidence: What is Bash? What […]
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When you parse CSV file in bash for the first time, the output looks completely wrong. Fields are shifted, the header row gets processed as data, and commas inside quoted values blow up your column structure. It happens to everyone, and honestly the second time too if you skip the IFS setup. Learning to parse […]
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× Lua is a small scripting language. It is fast, easy to learn, and runs inside a lot of software you already use. If you are on Linux and want to write scripts beyond bash, Lua is worth learning. I came across Lua the first time when I was debugging a custom Nginx configuration at […]
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× Most sysadmins reach for awk not because they planned to, but because grep stopped being enough. You have a log file, you need to count something, filter by a field, or pull a number out of structured output. That is exactly what awk for log analysis is built for. This guide is for Linux […]
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× You've got three projects to spin up today, and the first thing you do is open /etc/apache2/sites-available/ and start typing another virtual host config from scratch. Again. If you manage Apache on Ubuntu or Debian-based systems and find yourself creating virtual hosts more than once a week, this is for you. After working through […]
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× Linux vs Windows for developers is one of those choices that looks simple on the surface but costs you months of environment pain if you get it wrong. Most comparisons skim the surface, trade a few bullet points about "open source" versus "ease of use," and never go near what actually matters: path handling […]
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× You open a 200,000-line log file, and your boss asks you to create a report showing how many failed requests were made from each IP address before the end of the day. Most users will use Python. The ones who actually know what they're doing will use awk and get their answers within 45 […]
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