RosettaCodeData/Task/File-input-output/Run-BASIC/file-input-output.run

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open "input.txt" for input as #in
fileLen = LOF(#in) 'Length Of File
fileData$ = input$(#in, fileLen) 'read entire file
close #in
open "output.txt" for output as #out
print #out, fileData$ 'write entire fie
close #out
end
' or directly with no intermediate fileData$
open "input.txt" for input as #in
open "output.txt" for output as #out
fileLen = LOF(#in) 'Length Of File
print #out, input$(#in, fileLen) 'entire file
close #in
close #out