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"foo" is not recognized as an internal or external command, operable program or batch file. Some early Unix shells produced the equally cryptic " foo: no such file or directory " again accurately describing what is wrong but confusing users.
Some commands are internal—built into COMMAND.COM; others are external commands stored on disk. When the user types a line of text at the operating system command prompt, COMMAND.COM will parse the line and attempt to match a command name to a built-in command or to the name of an executable program file or batch file on disk.
In MS-DOS, a batch file can be started from the command-line interface by typing its name, followed by any required parameters and pressing the ↵ Enter key. When DOS loads, the file AUTOEXEC.BAT, when present, is automatically executed, so any commands that need to be run to set up the DOS environment may be placed in this file.
(For articles about commands built into the command processor see category Internal DOS commands.) Pages in category "External DOS commands" The following 71 pages are in this category, out of 71 total.
External commands run executables found in separate executable files. The command line interpreter searches for executable files with names matching the external command. [14] [15] param1 …paramN — parameters provided by the user. The format and meaning of the parameters depends upon the command. In the case of external commands, the values ...
Shell functions, especially if the command being created needs to modify the internal runtime environment of the shell itself (such as environment variables), needs to change the shell's current working directory, or must be implemented in a way which guarantees they it appear in the command search path for anything but an interactive shell ...
The Call command in COMMAND.COM only supports calling external batch files. File name parser extensions to the Set command are comparable with C shell. [further explanation needed] The Set command can perform expression evaluation. An expansion of the For command supports parsing files and arbitrary sets in addition to file names.
The Control Language (CL) is a scripting language originally created by IBM for the System/38 Control Program Facility [1] and later used in OS/400 (now known as IBM i). It bears a resemblance to the IBM Job Control Language and consists of a set of command objects (*CMD) used to invoke traditional programs or get help on what those programs do.