Linux and DevOps

📂 Full description CentOS is a Linux distribution (derived from Red Hat Enterprise Linux) that's popular with system admins, DevOps engineers, and home users alike. It's also used by many organizations for development and production servers. In this course, learn how to install and make your way around CentOS, perform common tasks from the command line, and get a firewall, a web server, and shared folders up and running. Instructor Scott Simpson also shares troubleshooting tips and discusses security-enhanced Linux (SELinux), which adds an additional level of security to CentOS.

🔅 Learning CentOS Linux 🌐 Author: Scott Simpson 🔰 Level: Beginner ⏰ Duration: 2h 11m

🌀 Learn how to install CentOS, perform common admin tasks from the command line, and get popular services up and running.

📗 Topics: CentOS, Linux 📤 Join Linux and DevOps for more courses

Quick Linux Tip 🐧

You can use the find command's -exec option to call an external program to perform a specific action on the returned files that match specific criteria. For example, deleting files, listing file perms, and so on.

$ find ~/ -type f  -exec ls -lah {} \;

This is very useful when performing the same action on multiple files in different locations. The above command is an example of listing the permissions and other metadata of every file the find command finds. A breakdown of the -exec option: • exec ls - this tells find to execute the ls command on every filename that matches the search string. • -lah - displays all files, including hidden files, their permissions, and other file metadata, such as sizes, in a human-readable format. • {} - The “{}” placeholder represents each filename and must be the last item in the parameter list. • ; - To indicate the end of the parameter list, a semicolon ";" is used. It must be escaped with a backslash "\" otherwise the shell will interpret it. You can also use the + instead of the ; to indicate the end of the parameter list. There should be a space between the + and the curly braces "{}". You can execute multiple commands using -exec in find. For example, this looks up word counts in text files and their disk usage in one invocation:

$ find . -name "*.txt" -exec wc {} \; -exec du -sh {} \;

That's it for today's tip! Follow us for more byte-sized Linux tips and be a better-informed Linux user🐧

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🔰 Bash scripting loops basics

🔰 Quick Linux Tip

If you're having trouble reading the directories in the $PATH variable, you can make use of the tr command to replace colons with the newline characters so each directory is displayed on a single line.

$ echo $PATH | tr ":" "\n"

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🔰 Bash Scripting Basics

🔰 Managing Swap Space Imagine your system has only 2GB of RAM, but an application requires 3GB. Without swap space, this process would fail or crash because there isn’t enough memory available. With swap, however, the OS can shift inactive data into this overflow area, making room for the application. In this way, swap acts as a safety net, allowing the system to handle memory-heavy tasks smoothly even when RAM is limited. While swap space isn't as fast as physical RAM, it can be a lifesaver in those situations.

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🔰 Quick Linux Tip🐧

You can enable timestamps in your bash command history to see when you ran previous commands. This can be useful for tracing what you were working on and when.

To add timestamps to your history, just set the HISTTIMEFORMAT environment variable like so:

$ export HISTTIMEFORMAT="%F %T "

Now when you view your history or grep through it, you'll see a timestamp next to each command indicating when it was run: $ history | tail -n 5 Or to save a couple of keystrokes: $ history 5 The format "%F %T" shows the date and time, but you can customize it to your liking.

Note: This does not put historical timestamps on commands you executed before setting HISTTIMEFORMAT and also this only works in bash.

🔅 How to Use AppImages on Linux: A Beginner’s Guide

The Linux Crash Course series on Learn Linux TV will teach you a valuable Linux-related concept or skill, one video at a time! This time around, Jay details the "AppImage", a special app format you can download and run immediately.

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🔰 Linux tar command The tar command in Linux is a go-to tool for creating backups, bundling files, and compressing archives. Short for tape archive, tar lets you group files into archives commonly called tarballs and compress them using algorithms like gzip, bzip2, and xz. If you’re packaging software or simply managing file storage, tar is a powerful tool to have in your Linux toolkit.

🔰 Linux commands for log parsing

tar command - how to archive files in Linux The tar command in Linux is a go-to tool for creating backups, bundling files, and compressing archives. Short for tape archive, tar lets you group files into archives commonly called tarballs and compress them using algorithms like gzip, bzip2, and xz. If you’re packaging software or simply managing file storage, tar is a powerful tool to have in your Linux toolkit.

🔰 Linux tar command

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📱 Docker for devops engineers.