A DOS error message that means DOS does not understand the command you entered, or it cannot find the program you asked it to run.
"Bad command or file name." YourDictionary, n.d. Web. 08 August 2018. <http://www.yourdictionary.com/bad-command-or-file-name>.
Bad command or file name. (n.d.). Retrieved August 08th, 2018, from http://www.yourdictionary.com/bad-command-or-file-name