"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 is produced if the user mistypes the first word of a command line. This first word must be either the name of a built-in "command", or of an executable file or batch file. Therefore the error was printing what, to the programmer, was an accurate description of the problem: there was no such command and there was no such file. Novices, in general, had trouble understanding the message, so later operating systems changed it; for instance, OS/2 and the Windows NT (and newer) family use
Some early Unix shells produced the equally-cryptic
Famous quotes containing the words bad, command and/or file:
“When a man’s partner’s killed, he’s supposed to do something about it. It doesn’t make any difference what you thought of him, he was your partner and you’re supposed to do something about it. As it happens, we’re in the detective business; well, when one of your organization gets killed, it’s, it’s bad business to let the killer get away with it. Bad all around. Bad for every detective everywhere.”
—John Huston (1906–1987)
“We can’t command our love, but we can our actions.”
—Sir Arthur Conan Doyle (1859–1930)
“A common and natural result of an undue respect for law is, that you may see a file of soldiers, colonel, captain, corporal, privates, powder-monkeys, and all, marching in admirable order over hill and dale to the wars, against their wills, ay, against their common sense and consciences, which makes it very steep marching indeed, and produces a palpitation of the heart.”
—Henry David Thoreau (1817–1862)