No double entries in the shell history

HISTCONTROL

   A colon-separated list of values controlling how commands are saved on the history list.
   If the list of values includes ignorespace, lines which begin with a space character
   are not saved in the history list. A value of ignoredups causes lines matching the
   previous history entry to not be saved. A value of ignoreboth is shorthand for
   ignorespace and ignoredups. A value of erasedups causes all previous lines matching
   the current line to be removed from the history list before that line is saved.
   Any value not in the above list is ignored. If HISTCONTROL is unset, or does not
   include a valid value, all lines read by the shell parser are saved on the history
   list, subject to the value of HISTIGNORE. The second and subsequent lines of a
   multi-line compound command are not tested, and are added to the history regardless
   of the value of HISTCONTROL.

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