"sudo" is not recognized as an internal or external command, operable program or batch file [closed]

I am trying to install reaver but every time I write sudo -s I get this message at the end

"sudo" is not recognized as an internal or external command, operable program or batch file. 

What am I doing wrong?

2 Answers

The phrase

... is not recognized as an internal or external command

Is specific to Windows. That is to say, you're at a Windows command prompt.

Use Ubuntu. You'll find your commands work slightly better there.

sudo is a Unix command to carry out a task as superuser.
By the phrase "is not recognized as an internal or external command, operable program or batch file.", I can already tell that you are using Windows.
Run sudo on Ubuntu. You are in a Q&A forum for Ubuntu users.