Linux的shell基础知识

1 cat /etc/shells 查看计算机上可用的shell2 编写shell，保存为firstscript#！ /bin/bash# This is a test.echo -n Your current directory is:pwdecho $HOMEecho Your current directory is:pwd#END.3 运行firstscript$ /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/shecho -n Please input your ID:read id_varecho -n Please input your password:read passwordecho User ID = $id_varecho password = $passwordif [ $password = "admin" ]; thenecho "password is right"elseecho "password is wrong"fi同前面的运行，自己测试。