> I find "export HISTCONTROL=ignoredups" in comment in .bashre and
> uncomment and save and logout.
> 
> It does not work!
> 
> I try the following commands:
> 
> ls
> pwd
> cd
> ls
> whoami
> 
> Then I press UP key.


Try:

pwd
cd
ls
ls
ls
pwd

then press UP and you will see difference.


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