The “If-Modified-Since” HTTP header is sent from an agent (browser/bot) to the web server in order to know if the requested page has been changed since its last visit. The server responds with a 200 code (Ok) if the page has been modified or with a 304 code (Not modified) if the page has not [...]

There are some really useful commands that can give information about the system directly from the console. Some of them are:

Ever had the need to see what headers a remote web site sends back to you when you request a page with your browser?

There are times you need to search for a particular string or pattern in multiple text files. This is when grep proves to be a really handy tool. Type:

You can create a multiline text file without using any text editor. This is done like this:

The default console resolution can be changed by passing the “vga=value” parameter from GRUB. You can do this at the boot screen or by editing the /boot/grub/grub.conf file. For example:

Ever had the need to change the console font in fedora? I did because using the default font greek characters were completely unreadable. So, here is how to do it.

SED is powerful. It can, besides many other things, substitute, append, remove characters or groups of characters or whole lines in a text file or the console output. You may find it difficult to use, but here is an excellent web page that will help you get going:

I was reading the Lynx man page the other day and I came across the –dump option. The output of: