chdir()

            {

            if [ -z "$1" ] ; then

                    cd

                    PS1="[$PWD]"

                    export PS1;

                    return

            elif [ "$1" = - ] ; then

                    cd -

                    PS1="[$PWD]"

                    export PS1;

                    return

            else

                    if [ -d "./$1" ] ; then

                    cd ./$1

                    PS1="[$PWD]"

                    export PS1;

                    return

                    fi

            fi
            
 
            
for LINE in `find $HOME -type d -print | grep -c \/$1$`

            do

            if [ $LINE -eq 0 ] ; then

                    echo "your directory $1 is not exsit($LINE)!"

                    return

            fi

            done
            
for Dir in `find $HOME -type d -print | grep \/$1$`

            do

                if [ $LINE -gt 1 ] ; then

                    if [ ! -d "$Dir" ] ; then

                    echo "$Dir is not a directory"

                    return

                    fi
            
        printf "$Dir\t\t...do you want to go? default(y)"

                    read YESNO

            #       echo "(y/n)="$YESNO
            
        if [ -z "$YESNO" ] ; then

                            YESNO=y

                    fi
            
        case "$YESNO" in

                            [yY]|[yY][eE][sS])

                                    YESNO=y ;;

                            [nN]|[nN][oO])

                                    YESNO=n ;;

                            *)

                                    YESNO="" ;;

                    esac
            
        if [ "$YESNO" = y ] ; then

                            cd $Dir

                            PS1="[$PWD]"

                            export PS1;
            
                return

                    else

                            continue

                    fi

              else

                            cd $Dir

                            PS1="[$PWD]"

                            export PS1;

                            return

              fi

            done

            }