1.maven教程
https://www.runoob.com/maven/maven-setup.html
2. source 四种执行方式的区别
3标题多为source和sh/. 执行的区别
source a.sh
. ./a.sh
source ./a.sh
. a.sh
https://www.cnblogs.com/jwentest/p/11151316.html
Linux Source命令及脚本的执行方式解析
http://www.51testing.com/html/38/225738-206878.html