Command line workshops require you to have access to a bash shell with vi/vim installed.
Mac OS X and Linux
On Mac OSX, which is based on a Unix environment, you can use the built in terminal program. Terminal can be found in the Utilities folder of the Applications folder. Linux systems similarly have a Shell program. Both should have vi/vim installed. Check by typing
Windows, which is not Unix based, does not come with a bash shell. You can download Git Bash, which will allow you to use both git and bash on a Windows computer. It comes with vi/vim installed.
Advanced Users: Alternatively, if you have a 64-bit version of Windows 10, you can activate a bash shell. See these directions. The latter option is not recommended for those who are not confident in their use of and understanding of the Windows operating system.