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Special or Random characters on PuTTy screen

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Recently I have been noticing some weird special characters on my PuTTy screen.  There was no pattern to it. It will appear all of a sudden.

Its so annoying when you are working on a script.

ex: ^[[28~

Reason : To keep my windows active from locking, I had installed an application called ‘caffeine’ .  Caffeine periodically sends a key stroke to my session active. Whenever caffeine sends a keystroke and if my PuTTy is active it a special weird character gets displayed on screen.

Solution : Set the status of Caffeine to InActive when using PuTTy and it solves the problem.

 

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