Bad Command or File Name

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

Some early Unix shells produced the equally-cryptic : no such file or directory (because they searched for a file matching the command name and this is the strerror when a file of a given name is not found). Most modern shells produce : Command not found.

Famous quotes containing the words bad, command and/or file:

    “A bad end, a sad end, was the last end of Mieze. And why, why, why? What crime had she committed? She came from Bernau into the whirl of Berlin, she was not an innocent girl, certainly not, but her love for him was pure and steadfast; he was her man and she took care of him like a child. She was struck down because she happened by chance to encounter this man; such is life, it’s really inconceivable.”
    —Alfred Döblin (1878–1957)

    “It is manifest therefore that they who have sovereign power, are immediate rulers of the church under Christ, and all others but subordinate to them. If that were not, but kings should command one thing upon pain of death, and priests another upon pain of damnation, it would be impossible that peace and religion should stand together.”
    —Thomas Hobbes (1579–1688)

    “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)