pcd - Parent Change Directory -- One of my favourite little .bashrc includes. Just source this file from .bashrc and then at a command prompt you can type "pcd <some parent dir>" and you'll be automatically back to the folder specified

pcd.sh

find_target(){
    ## The target directory
    _target=$1
    ## Iterate through the parent directories
    printf "%s\n" "$PWD" | sed -r 's#/#/\n#g' |
    while read parent_dir; 
    do
    ## Check if the target directory exists under this
    ## aprent directory and if it does, print the
    ## target's path and break the loop.
    _path="${_path}${parent_dir}"
    [ -d "${_path}${_target}" ] && echo "${_path}${_target}" && break
    done
}

## If the value passed as an argument to
## this function exists as a subdirectory of
## any of the current directory's parents, 
## cd into it. Else, fail silently.
pcd(){
  cd "$(find_target $1)" 2>/dev/null
}