Open a universal command prompt in the folder with the files you want to compare. Type fc textfile1.txt textfile2.txt into the command window, then press Enter.

Command Prompt and Windows PowerShell are also simple and built-in options covered in this post for this purpose. We have already seen how to open a file or folder using Command Prompt or PowerShell.

The "open" program is specific to OS X and lets you basically drag and drop a file with the -a command onto an application. This way it overrides the per-user OBJ open-with settings.

If you want to open an Elevated Command Prompt, which is one that runs with Administrator privileges, you can see the How to open a Windows 10 Elevated Command Prompt article instead.

You can stop or prevent Command Prompt from closing immediately after opening or executing a batch file using Pause, cmd /k or editing Registry.

Command Prompt lets you create all kinds of files on your Windows PC. Here's a guide explaining all the different methods to create a file using Command Prompt.

Press "Alt-F2" to open a command line prompt within Unity. Type the command for Evince with your PDF file's name, file extension and its full path relative to the Home directory.