Tandy 1000 MS-DOS Reference Manual page 130

Chapter 6 / Command Reference
Examples
if not exist myfile echo can't find flle
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ENTER
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displays
Can' t fin d f i 1e
if the file Myfile doesn't exist.
if exist all.lst goto g
sends program execution to the line after :G if all.lst exists.
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: !
~
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~
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.-..1
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