学习shell --script的执行方式区别（source 、 shscript 、./script）

利用直接执行的方式来执行script：

[root@localhost shelldemo]# echo $firstname $lastname

[root@localhost shelldemo]# sh sh02.sh 
Please input your first name : gao
Please input your last name : zhen'an

Your full name is :gao zhen'an 
[root@localhost shelldemo]# echo $firstname $lastname
                                                        #
[root@localhost shelldemo]# source sh02.sh  #利用source来执行脚本：在父进程中执行：
Please input your first name : gao
Please input your last name : zhenan

Your full name is :gao zhenan 
[root@localhost shelldemo]# echo $firstname $lastname
gao zhenan
[root@localhost shelldemo]#