linux简单操作和自检

1、查看摄像头属性
v4l2-ctl –list-formats

ioctl: VIDIOC_ENUM_FMT    Index       : 0    Type        : Video Capture    Pixel Format: 'YUYV'    Name        : YUV 4:2:2 (YUYV)    Index       : 1    Type        : Video Capture    Pixel Format: 'MJPG' (compressed)    Name        : MJPEG

2、检测摄像头

cd ~/ws/srcmkdir -p usb_camcd usb_camgit clone https://github.com/bosch-ros-pkg/usb_cam.git cd ~/ws catkin_makesource ~/ws/devel/setup.bash roscd usb_cam

运行并测试图像：
rosrun usb_cam usb_cam_node
rosrun image_view image_view image:=/usb_cam/image_raw

3、ubuntu14.04 LTS运行python时遇到 “No module named _sysconfigdata_nd”
ubuntu的一个bug，具体解决方法为创建一个软链接：
sudo ln /usr/lib/python2.7/plat-x86_64-linux-gnu/_sysconfigdata_nd.py /usr/lib/python2.7/
然后问题解决了

4、问题描述
创建工作空间

$ mkdir -p ~/catkin_ws/src  $ cd ~/catkin_ws/src  $ cd ~/catkin_ws/  $ catkin_make 

出错

#### Running command: "cmake /home/shuifu/catkin_mybot/src -DCATKIN_DEVEL_PREFIX=/home/shuifu/catkin_mybot/devel -DCMAKE_INSTALL_PREFIX=/home/shuifu/catkin_mybot/install -G Unix Makefiles" in "/home/shuifu/catkin_mybot/build"####-- Using CATKIN_DEVEL_PREFIX: /home/shuifu/catkin_mybot/devel-- Using CMAKE_PREFIX_PATH: /home/shuifu/catkin_ws/devel;/opt/ros/indigo-- This workspace overlays: /home/shuifu/catkin_ws/devel;/opt/ros/indigo-- Using PYTHON_EXECUTABLE: /home/shuifu/anaconda2/bin/python-- Using Debian Python package layout-- Using empy: /usr/bin/empy-- Using CATKIN_ENABLE_TESTING: ON-- Call enable_testing()-- Using CATKIN_TEST_RESULTS_DIR: /home/shuifu/catkin_mybot/build/test_results-- Found gtest sources under '/usr/src/gtest': gtests will be built-- Using Python nosetests: /usr/bin/nosetests-2.7ImportError: "from catkin_pkg.package import parse_package" failed: No module named catkin_pkg.packageMake sure that you have installed "catkin_pkg", it is up to date and on the PYTHONPATH.CMake Error at /opt/ros/indigo/share/catkin/cmake/safe_execute_process.cmake:11 (message):  execute_process(/home/shuifu/anaconda2/bin/python  "/opt/ros/indigo/share/catkin/cmake/parse_package_xml.py"  "/opt/ros/indigo/share/catkin/cmake/../package.xml"  "/home/shuifu/catkin_mybot/build/catkin/catkin_generated/version/package.cmake")  returned error code 1Call Stack (most recent call first):  /opt/ros/indigo/share/catkin/cmake/catkin_package_xml.cmake:63 (safe_execute_process)  /opt/ros/indigo/share/catkin/cmake/all.cmake:151 (_catkin_package_xml)  /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:20 (include)  CMakeLists.txt:52 (find_package)-- Configuring incomplete, errors occurred!See also "/home/shuifu/catkin_mybot/build/CMakeFiles/CMakeOutput.log".See also "/home/shuifu/catkin_mybot/build/CMakeFiles/CMakeError.log".Invoking "cmake" failed

解决过程
默认的Python编译器是anaconda2/bin/python
现将默认编译器改为系统自带的python2.7
重新打开终端，使更改生效，这时查看python –version

参考备注：
http://blog.exbot.net/