What is HAR file? Har or HTTP Archive Format file is a JSON format that is used to analyze and detect bugs during an HTTP session.

Windows Update uses Event Tracing to generate diagnostic logs & saves them in .etl format. Use Get-WindowsUpdateLog PowerShell command to read the logs.

You can customize the macOS Console's log window to change the way it behaves. Here's how to adjust it for your needs.

If you do not have access to the Console utility in OS X, you can still read log file information and console messages using various commands in the Terminal.

With tail, you can view a Linux log file as the system writes to it in real time. So while you’re trying to troubleshoot that system, you can follow the syslog, the auth.log, faillog, kern.log ...