while条件循环语句

#vi guess.sh

[PRICE(变量值) t（参数值）=0] let t++（操作一次加一)]#ll guess.sh#chmod 744 guess.sh#chmod root: guess.sh#chmod 744 guess.sh#ll guess.sh#./guess.sh

yes和no的循环语句

#vi yesorno.sh

case条件测试语句

#vi check.sh#!/bin/bashread -p "请输入一个字符，并按"

#chmod 777 check.sh

#./check.sh