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脚本：
#testlogin.sh
username=""
password=""
Prompt
read username
while[$username !="Q"]
do
if [$username!=""]
echo -n "password for $username:"
stty -echo
read password
stty echo
case $username in
root)
echo "hello, root. your password is \"$password\",be careful not to let out your password "
；；
*）
echo "hello. $username. your password is \"$password\"."
；；
esac
echo "welcome to the system"
fi
Prompt
read username
done
Prompt()
{
echo "login emulation (Type 'Q' to quit)"
echo -n "login:"
}
——————————————————————————————————————————————————
pangyang@pangyang-desktop:~$ ./testlogin.sh
./testlogin.sh: line 4: Prompt：找不到命令

./testlogin.sh: line 6: while[ !=Q]：找不到命令
./testlogin.sh: line 7: 在未预料的“do”附近出现语法错误
./testlogin.sh: line 7: ` do '

1、定义放在调用前
2、[]要空格

改过，还是有错误：
#testlogin.sh
username=""
password=""

Prompt()
{
echo "login emulation (Type 'Q' to quit)"
echo -n "login:"
}
Prompt
read username
while [ $username !="Q" ]
do
if [$username!=""]
echo -n "password for $username:"
stty -echo
read password
stty echo
case $username in
root)
echo "hello, root. your password is \"$password\",be careful not to let out your password "
；；
*）
echo "hello. $username. your password is \"$password\"."
；；
esac then
echo "welcome to the system"
fi
Prompt
read username
done
——————————————————————————————————————————————
pangyang@pangyang-desktop:~$ sh testlogin.sh
login emulation (Type 'Q' to quit)
login:root
[: 31: root: unexpected operator

if [$username!=""] 空格

sai9924, 空格我全换过来了，还是没用。
[: 31: root: unexpected operator
这是什么错？

#testlogin.sh
username=""
password=""

Prompt()
{
echo "login emulation (Type 'Q' to quit)"
echo -n "login:"
}
Prompt
read username
while [ "$username" != "Q" ]
do
if [ "$username" != "" ]
echo -n "password for $username:"
stty -echo
read password
stty echo
case $username in
root )
echo "hello, root. your password is \"$password\",be careful not to let out your password "
;;
* ）
echo "hello. $username. your password is \"$password\"."
;;

esac then
echo "welcome to the system"
fi
Prompt
read username
done

sai9924, 谢谢，问题解决了，非常开心。不过你改了哪里呀？