为什么80%的码农都做不了架构师？>>> 
Linux下启动启动tomcat 服务器报错 The file is absent or does not have execute permission
报错如下：
Cannot find ./catalina.sh
The file is absent or does not have execute permission
This file is needed to run this program
说明catalina.sh没有执行权限，可以把~/apache-tomcat-7.0.33/bin/目录下的所有sh文件的权限都设为777即可。
在bin目录下运行命令：
chmod 777 *.sh
再运行startup.sh
