本文主要部分来源于ROS官网的Tutorials.
roswtf是ROS的检查工具，用于检查ROS安装和运行系统。
Checking your installation&Offline
make sure your roscore is NOT running.
$ roscd
$ roswtf
Trying it online
$ roscore &
$ roscd
$ roswtf
Trying it with Errors
Stop the roscore to simplify the output that you see.
$ roscd $ ROS_PACKAGE_PATH=bad:$ROS_PACKAGE_PATH $ roswtf
roswtf now gives us an error about the ROS_PACKAGE_PATH setting.
