It is just a simple setting I need everytime installing a new unix machine. May be it’s paranoid but in my opinion the file-based history logging should be disabled for security reasons – at least in the root account. You can easily do that by open the .bashrc file in the particular home directory and add the following line(s):
export HISTFILESIZE=0
Disables the file-based history logging.
export HISTSIZE=0
Disables the history logging.
By the way zero in the two statements above means: 0 entries in the history = history is disabled 
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