edited the description

the original description implied that HISTCONTROL=erasedups will also
erase duplicates from the history file. that is not the case. see bug
#189881

** Description changed:

  By default, when a command is used in a console, that one is saved in bash 
history.
- The problem is that each new command is saved again even if that command 
exist in history: .bash_history become fatty & it's a pain to recall a previous 
command using arrows.
+ The problem is that each new command is saved again even if that command 
exist in history. bash history become fatty & it's a pain to recall a previous 
command using arrows.
  
  The solution is to modify the .bashrc file by adding:
  export HISTCONTROL=ignoredups:erasedups
  
  to prevent duplicates
  
  Please, make that change as default.

-- 
bash history without duplicates
https://bugs.launchpad.net/bugs/415217
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