Go to a directory within the current path

gistfile1.sh

function cd..() {                                                                                                                                                                                                                       
  if [ -z $1 ]; then                                                                                                                                                                                                                    
    cd ..                                                                                                                                                                                                                               
  else                                                                                                                                                                                                                                  
    grep "\/" <<<$1 &>/dev/null                                                                                                                                                                                                         
    if [ $? -eq 0 ]; then                                                                                                                                                                                                               
      echo "Invalid filename"                                                                                                                                                                                                           
      return                                                                                                                                                                                                                            
    fi                                                                                                                                                                                                                                  
    grep $1 <<<`pwd` &>/dev/null                                                                                                                                                                                                        
    if [ $? -eq 0 ]; then                                                                                                                                                                                                               
      pushd . &>/dev/null                                                                                                                                                                                                               
      while [ $(basename  `pwd`) != $1 ]; do                                                                                                                                                                                            
        cd .. &>/dev/null                                                                                                                                                                                                               
      done                                                                                                                                                                                                                              
      popd &>/dev/null                                                                                                                                                                                                                  
      cd - &>/dev/null                                                                                                                                                                                                                  
    else                                                                                                                                                                                                                                
      echo "Could not find $1 in path to current working directory"                                                                                                                                                                     
    fi                                                                                                                                                                                                                                  
  fi                                                                                                                                                                                                                                    
}