启动Dos模拟环境的shell小脚本

做了一个启动Dos模拟环境的shell小脚本：

#!/bin/sh

IMGDIR=/home/wangyao/Exam/dos.img
MNTDIR=/media/floppy0

# Only the root can mount
if [ ${UID} != 0 ]; then
    echo "Error,Only root can mount the image!"
    exit 1
fi

#mount the dos image
mount | grep /media/floppy0 > /dev/null

if [ $? -eq 0 ];then
    umount $MNTDIR
fi
mount -o loop $IMGDIR $MNTDIR

#qemu boot from the dos
qemu -fda $IMGDIR -boot a