"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:
“Vulgarism in language is the distinguishing characteristic of bad company, and a bad education. A man of fashion avoids nothing with more care than that. Proverbial expressions, and trite sayings, are the flowers of the rhetoric of vulgar man.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)
“Children from humble families must be taught how to command just as other children must be taught how to obey.”
—Friedrich Nietzsche (1844–1900)
“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)