Linux shell脚本：创建一个包含当前日期名称的文件夹

我正在尝试制作一个简单的备份脚本,我在创建一个名称为curent date的文件夹时遇到问题

我的脚本是那个,基本上问题出在最后一行

drivers=$(ls /media/)

declare -i c=0
for word in $drivers
do
    echo "($c)$word"
    c=c+1
done

read -n 1 drive
echo

c=0
for word in $drivers
do
    if [ $c -eq $drive ]
    then
        backuppath="/media/$word/backup"
    fi
    c=c+1
done


echo "doing back up to $backuppath"

cp -r /home/stefanos/Programming $backuppath/$(date +%Y-%m-%d-%T)

输出继电器：

(0)0362-BA96
(1)Data
(2)Windows
0
doing back up to /media/0362-BA96/backup
cp: cannot create directory `/media/0362-BA96/backup/2012-12-05-21:58:37': Invalid argument

路径是三重检查,直到/ media / 0362-BA96 /

解决了：
????是什么janisz说最终的剧本看起来像

drivers=$(ls /media/)

declare -i c=0
for word in $drivers
do
    echo "($c)$word"
    c=c+1
done

read -n 1 drive
echo

c=0
for word in $drivers
do
    if [ $c -eq $drive ]
    then
        backuppath="/media/$word/backup"
    fi
    c=c+1
done
echo "doing back up to $backuppath"

backup(){
  time_stamp=$(date +%Y_%m_%d_%H_%M_%S)
  mkdir -p "${backuppath}/${time_stamp}$1"
  cp -r "${1}" "${backuppath}/${time_stamp}$1"

  echo "backup complete in $1"
}

#####################The paths to backup####################

backup "/home/stefanos/Programming"
backup "/home/stefanos/Android/Projects"
backup "/home/stefanos/Dropbox"