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。