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tune alpha value to show axis

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# record a replay
mkdir relay
cd relay
rosbag record -a

# play back
rosbag play my_bag_files

# twice as fast

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rosed [package_name] [filename]
rosed roscpp Logger.msg


# list all editable files
rosed [package_name] <tab><tab>

# set editor
export EDITOR='emacs -nw'

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<launch>

<group ns="turtlesim1">
    <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
  </group>

  <group ns="turtlesim2">
    <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
  </group>
  

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# list parameter
rosparam list

# set parameter
rosparam set parameter_name 
rosparam set /background_r 150

# get parameter
rosparam get /background_g 

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# start ros master + rosout + ps
roscore

# list all the running nodes
rosnode list

# get information
rosnode info /rosout

# run ros node

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# show message definition
rosmsg show sensor_msgs/CameraInfo

# show message type
rostopic type rosout

# quick message definition view
rostopic type rosout | rosmsg show

# echo message live content

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# Standard metadata for higher-level stamped data types.
# This is generally used to communicate timestamped data 
# in a particular coordinate frame.
# 
# sequence ID: consecutively increasing ID 
uint32 seq
#Two-integer timestamp that is expressed as:
# * stamp.sec: seconds (stamp_secs) since epoch (in Python the variable is called 'secs')
# * stamp.nsec: nanoseconds since stamp_secs (in Python the variable is called 'nsecs')
# time-handling sugar is provided by the client library

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# install all dependencies of a package
rosdep install my_package

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to be added