(Windows only)
Runs
a program, DOS command, or DOS batch file, or starts the DOS command
processor, which allows interactive processing of DOS commands.
Syntax
DOS [ SILENT ][command-token| VALUE ( expression ) ]...
|
- SILENT
- After processing a DOS statement, the AVM shell pauses, and prompts
you to press SPACEBAR to continue.
When you press SPACEBAR, the AVM
clears the window and continues processing. You can use the SILENT
option to eliminate this pause. Use this option only if you are
sure that the DOS program, command, or batch file will not generate
output to the window.
-
command-token
| VALUE
( expression )
- 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.
-
The commands can contain Unicode characters. See OpenEdge Development:
Internationalizing Applications for more information about Unicode.
Example
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.
r-dos.p
IF OPSYS = "UNIX" THEN UNIX ls.
ELSE IF OPSYS = "WIN32" THEN DOS dir.
ELSE DISPLAY OPSYS "is an unsupported operating system".
|
Note
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.
