In this Linux tip, learn how to use exiftool. It's an app that you can install on your Linux system to pull metadata from jpg and png files. That metadata provides information such as the date the image was created or last modified, the image size in pixels and the image resolution.
In this Linux tip, learn how to use the help command. It's a command that provides useful information on bash "builtins". Those are commands that are built into, in other words "part of" the bash shell, not executables on their own.
In this Linux tip, learn how to use the tool called speedtest. It allows you to check the speed of your connection to your Internet provider. The tool is not installed on Linux systems by default, but is easy to find and install.
In this Linux tip, learn how to use the blkid command. It gives you a very useful view of block devices on your Linux system. First, it shows the devices (e.g., /dev/sda1). It shows the UUIDs (the 128 bit long "universally unique identifiers") associated with each of them, the block sizes, the file system types and, when available, the PARTUUIDs.
In this Linux tip, learn how to use the ps command. It displays information on running processes. If you want to see only certain processes, you can pass the output of a ps command to grep and specify what you want to see – for example, by username or process name.
In this Linux tip, learn how to use the head and tail commands. They're basic commands that every Linux user should know. The head command is generally used to display the top lines in a text file, and the tail command shows the last lines in a file.
In this Linux tutorial, learn how to use the pi command. You probably won't need it very often, but, if you need to calculate pi to some arbitrary number of digits, you'll probably be surprised at how easy this can be.
In this Linux tip, learn how to use the rig command. It randomly generates name, address and phone number listings. It's useful when you're testing an application and need hundreds or thousands of addresses to make sure that it works correctly.
In this Linux tip, learn how to use the lslogins command. It provides some useful details on user accounts and logins. In its simplest form, you could just type lslogins, but without using sudo, some of the details you'll probably want to see won't be available because the files in which it's stored won't be readable.