Clear command history in Linux

In bash, to clear the command history, execute the following command

$ rm -rf /.bash_history

To disable history of the commands execute the following command

$ ln -s /dev/null /.bash_history

The above command in essence redirects all history data to /dev/null file, which is a dummy file (NULL file).

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Alternatively, you can set the HISTSIZE variable in /etc/profile to 0.