This article is about how to use the 'tail' command. Here is an overview of how you can use the 'head' and 'tail' commands to output different parts of a file: Use The Following Commands to output the last 3 lines of the file/steam.

Tmux has liberated me from tiling window mangers. Not that I didn’t like those, but I occasionally have to work with macOS or default GNOME setups.

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Practical tcpdump examples to lift your network troubleshooting and security testing game. Commands and tips to not only use tcpdump but master ways to know your network.

Using sar you can monitor performance of various Linux subsystems (CPU, Memory, I/O..) in real time. Using sar, you can also collect all performance data on an on-going basis, store them, and do historical analysis to identify bottlenecks. Sar is part of the sysstat package.

There will come a time when you will find yourself asking “What the heck is that process doing?”. To uncover the mysteries behind the behaviour of a process, we have a tool called strace. The program strace is very handy when you want to debug the execution of a program.

At the last AWS re:Invent, I gave a talk on "Performance Tuning EC2 Instances", where I showed how my team (Performance and Reliability Engineering) tunes Linux EC2 instances at Netflix. This includes instance selection, EC2 features, Linux kernel tuning, and the use of observability.

This talk discusses Linux profiling using perf_events (also called "perf") based on Netflix's use of it. It covers how to use perf to get CPU profiling working and overcome common issues.