I recently needed to search and replace some text in a large number of PHP scripts. Back in my Windows days I had a lightweight freeware programme that was perfect for the job. But what to do on Linux? The answer was to combine grep and sed. But don’t forget to watch out for Git!
It’s arguably a good idea to move your SSH listener off port 22. This is a quick and easy way to reduce hacking attempts and one of the first things you can do to further secure your server.
Use come command-line fu to analyse your website log in real-time and find out which IP addresses are making the most requests.