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As a system administrator or web developer, digging through log files to pinpoint specific issues like 404 Not Found or 500 Internal Server Error can be a daunting task, especially when dealing with high traffic websites. Fortunately, Linux offers powerful tools like grep, awk, and sed that can simplify this process. This guide will provide you with practical examples to filter your web server logs for these specific HTTP response codes using bash commands. Before we start filtering logs, it’s essential to understand the format of the log files generated by your web server. Apache and Nginx, two of the most popular web servers, store access logs with each request’s details.