[luatex] Why LuaTeX forces extension on reading and writing files?

Igor Liferenko igor.liferenko at gmail.com
Tue Jan 19 13:21:36 CET 2016

Hi all,

LuaTeX requires extension in file name to work correctly. Consider these tests:

Test for reading (does not work without extension):

    $ echo a > in

      \message{I am not able to open the file for reading}

Test for writing (adds .tex extension):


How LuaTeX justifies this odd behavior? Is this just a bug which has
not been fixed or it is intentional?

Extensionless filename is perfectly legitimate - why force an extension?

Best regards,

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