A shell function to cd to files/directories in your parent

up.sh

up() {
  local cdinto=0 x= traverse= curpath=

  [[ $1 ]] || { cd ..; return; } # default to 1 level
  [[ $1 = -d ]] && { cdinto=1; shift; }

  for x; do
    if [[ $x == +([[:digit:]]) ]]; then
      (( x == 0 )) && return # noop

      # build a path to avoid munging OLDPWD
      while (( x-- )); do
        traverse+=../
      done

      cd "$traverse"
    else
      curpath=$PWD

      while [[ $curpath && ! -e $curpath/$x ]]; do
        curpath=${curpath%/*}
      done

      if [[ $curpath ]]; then
        if [[ $curpath != "$PWD" ]]; then
          if (( cdinto )); then
            cd "$curpath/$x"
          else
            cd "$curpath"
          fi
        fi
      else
        printf "error: failed to locate \`%s' in a parent directory\n" "$x"
        return 1
      fi
    fi
  done
}