Appraently this is not the best solution since everytime you will need to delete the contents. There is an variable that you can set to set history to 0 but if you just need to delete history everythime you logout just add the cat thing in .bash_logout if not there create it.
if you are using Bash shell, history of your commands will be in $HOME/.bash_history, remove the contents of the file, but it will contain only the history of previous session. to remove the history of current session command is "history -c".
[Ashish Desai]
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