Tandy 1000 MS-DOS Reference Manual page 120

Chapter 6 / Command Reference
This batch file checks to see if a file exists before copying it.
Suppose Newfile.asm exists in the root directory of Drive B, and
you execute the batch file by typing:
Chekdest B: \ oldfile.asm newfile.asm
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ENTER
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As instructed in the command line, the batch file replaces %1
with B:, making Drive B the current 'drive. It then replaces %2
with \, making the root directory the current directory. Finally,
it replaces %3 with Oldfile.asm and %4 with Newfile.asm.
The batch file checks to see if Newfile.asm exists in the current
directory. If it does, the batch file uses the TYPE command to
display Newfile.asm. Then it pauses. If you want to copy over
Newfile.asm, press the space bar. If not, press
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CIRL
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If Newfile.asm does not exist in the directory, the batch file goes
to the line following :G. Therefore, it does the copy automatically,
without pausing.
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