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I have recently updated Mathematica to 12.1. Whenever I export strings as text now, as in the following MWE:

    Export["test.txt", "a", "Text"]

a highlighted question mark appears at the very end of the underlying txt file:

screenshot

Then I need to put extra effort to remove. How I can avoid this problem?

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  • $\begingroup$ I suspect that you are opening in an editor that uses this convention to warn you of a missing eol. $\endgroup$ – Alan Oct 5 '20 at 18:01
  • $\begingroup$ Look at test.txt in a hex editor and it should only contain a single byte 0x61. $\endgroup$ – flinty Oct 5 '20 at 18:02
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To include an eol, try this:

Export["test.txt", "a\n", "Text"]
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  • $\begingroup$ That's it. It worked out! Thanks a lot! $\endgroup$ – david1983 Oct 5 '20 at 18:19

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