bat, but Windows NT introduced a new extension. The traditional file extension for batch files is. (Early DOS versions didn't support the preceding sign which suppresses display of that line, so they just had ECHO OFF which accomplished the desired output suppression for subsequent lines, but did display that line first.) Often the first line of the batch file is OFF, which suppresses display of the command lines as they execute. They can include execution of any programs which can be run from the command line, though once the other program starts running its input/output is under that program's control and does not come from the batch file (though the batch file continues executing once the program terminates). Commands are found one per line (with CR+LF, hex 0D 0A, separating lines), and are executed as if typed directly into the command line. Batch files are files under the various versions of PC/ MS-DOS, Windows, OS/2, and compatible systems which contain commands to be interpreted by the command-line DOS interpreter of those systems.
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