Create ros.md

ahangchen · Mar 22, 2022 · 0c578a0 · 0c578a0
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+# ROS
+
+- 从某个时间开始play bag：`rosbag play -t 10 xxx.bag`，其中，10的单位为秒，表示从多少秒开始play
+- crop bag中的一段：`rosbag filter xxx.bag t.to_sec() >=163465898.xxx`，取bag中符合filter条件的部分
+- 列出所有topic：
+  - rostopic list
+  - rostopic list -b xxx.bag
+- 打印某个topic具体内容：
+  - `rostopic echo /topic`
+  - `rostopic echo /topic -b xxx.bag`