if [-f filename] 判断文件   ; if [-d dir] 判断目录 f [-r file] 判断文件是否可读 w 可写 x 可执行  z 是否为空

case 变量 in

for循环 do

echo -n 一行输出  -e 对\ 命令进行解释   t 使用tab空格


如果要全部输出,可以用通配符* 来实现。  如果想要改变其中某个值可以使用 变量[位置]=新值



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