Bad command or file name
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"Bad command or file name" is a common error message in Microsoft's MS-DOS and some other operating systems.
In command.com, the message Bad command or file name indicates a "syntax error" message, which had its origins in the BASIC interpreters of the 1980s.[citation needed] Most often, this error message results from mistyping a command to be executed. Novices, in general, and quite a few experienced users as well, had trouble understanding the message, so later GUI operating systems changed this message; for instance, OS/2 and the Windows NT family use <typed-in string> is not recognized as an internal or external command, operable program or batch file.
Bash, a variant of the Bourne shell designed for GNU and used on various UNIX-like operating systems, produces the similar <typed-in string>: command not found.
