add function to multiple change directory back and or jump back to an existing directory in path name

add function to .bashrc for mcd aka cd..

# function to multiple change directory at once or jump back to an existing directory in the path
# using:  cd.. n  or cd.. dir or cd.. *part_of_directory*
function mcd() {
  case $1 in
    *[!0-9]*)                                          # check if it is a number
      cd $( pwd | sed -r "s|(.*/$1[^/]*/).*|\1|" )     # loopup for name or part of name of directory
      ;;                                               # if not a number and not an existing directory of path do nothing
    *)
      cd $(printf "%0.0s../" $(seq 1 $1));             # change back directory n times
      ;;
  esac
}
alias 'cd..'='mcd'                                # set alias for function so 2 options to run mcd n or cd.. n