One or more command (command-token) words and symbols that you want to pass to a DOS command processor. The VALUE option generates the command tokens included in
expression, a character string expression. The specified combination of
command-token and VALUE (
expression ) options can form any legal combination of commands and command options permitted by the DOS command processor, including programs, DOS commands, and batch files. If you do not use any of these options, the DOS statement invokes the DOS command processor, which remains until you exit it.
On UNIX, this procedure runs the UNIX ls command. In Windows, this procedure runs the DOS
dir command. On other platforms, the AVM displays a message stating that the operating system is unsupported.
If you use the DOS statement in a procedure and the procedure compiles on a UNIX system, the procedure runs, as long as flow of control does not pass through the DOS statement while running on UNIX. Use the OPSYS function to return the name of the operating system where a procedure is being run. This function lets you write applications that are portable among OpenEdge-supported operating systems even if they use the DOS, UNIX, etc. statements.
