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#
# Usage: mycd <path>
#
#  Replacement for builtin 'cd', which keeps a separate bash-history
#   for every directory.
function mycd()
{
   history -w # write current history file
   builtin cd "$@" # do actual cd
   local HISTDIR="$HOME/.dir_bash_history$PWD" # use nested folders for history
   if  [ ! -d "$HISTDIR" ]; then # create folder if needed
      mkdir -p "$HISTDIR"
   fi
   export HISTFILE="$HISTDIR/bash_history.txt" # set new history file
   history -c  # clear memory
   history -r # read from current histfile
}

shopt -s histappend
alias cd="mycd"
export HISTFILE="$HOME/.dir_bash_history$PWD/bash_history.txt"