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function keys in htop command not working in putty

The Function keys ( F1,--F9)  in  Linux  command htop is not  responding. To resolve this,  make sure to set the " Terminal Emulation " function to " Auto " under  " Account -> Preferences -> Terminal Emulation "

terminal emulation


Once the, Terminal Emulation is set correctly, the  fn keys in command htop will start to respond correctly in ezsh shell while using Putty.

htop in putty


Also, if you still continue to have issues with the Fn keys, do refer the article   to  modify the setting in Putty under   Terminal > Keyboard . Change the " Function keys and keypad"  setting to  "Xterm R6" .

To change terminal emulation for all users from the database. Refer this article.