Thanks to all of you for your kind help. In summary, I conclude that command sudokutrainer.pl is the best choice for Linux.

BTW, on Windows the command sudokutrainer works because there is a batch script  sudokutrainer.bat created automatically in parallel to the Perl script  sudokutrainer.pl.

In reply to Re^2: How start an application on Linux by GUIfriend
in thread How start an application on Linux by GUIfriend

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