1 cat /etc/shells

查看计算机上可用的shell

2 编写shell，保存为firstscript

#! /bin/bash

# This is a test.

echo -n Your current directory is:

pwd

echo $HOME

echo Your current directory is:

pwd

#END.

3 运行firstscript

$ /bin/bash firstscript

如果找不到文件 使用pwd查看当前目录

$ /bin/bash pwd/firstscript

可见当前运行结果。

4 可以修改firstscript为执行

$chmod a+x firstscript

此时输入$ ./firstscript即可

上面的shell没有交换，我们可以进行交互，如下：

#!/bin/sh

echo -n Please input your ID:

read id_var

echo -n Please input your password:

read password

echo User ID = $id_var

echo password = $password

if [ $password = "admin" ]; then

echo "password is right"

else

echo "password is wrong"

fi

同前面的运行，自己测试。