Bash

up

# Go up directory tree X number of directories
function up() {
  COUNTER="$@";
  # default $COUNTER to 1 if it isn't already set
  if [[ -z $COUNTER ]]; then
    COUNTER=1
  fi
  # make sure $COUNTER is a number
  if [ $COUNTER -eq $COUNTER 2> /dev/null ]; then
    nwd="`pwd`" # Set new working directory (nwd) to current directory
    # Loop $nwd up directory tree one at a time
    until [[ $COUNTER -lt 1 ]]; do
      nwd="`dirname "${nwd}"`"
      let COUNTER-=1
    done
    cd "${nwd}" # change directories to the new working directory
  else
  # print usage and return error
  echo "usage: up [NUMBER]"
  return 1
fi
}