Even as a super awesome engineer, there are still basic things that I always forget. Like 1+1… or whether it’s cos(0)=1 or sin(0)=1. That’s why it’s so useful to have a cheatsheet at all times!
Anyhow, here are some things I have to search Google for waaaay too often:
Converting MOV to GIF:
ffmpeg -i home_anim3.mov -vf scale=560:560/a -pix_fmt rgb24 -r 20 -f gif - | gifsicle --optimize=3 --delay=5 > home_anim3.gif
Got this from here.
Markdown:
Great Markdown cheatsheet
Viewing ROS image topics:
rosrun image_view disparity_view image:=/camera/depth_registered/disparity
or
rosrun image_view image_view image:=/camera/rgb/image_color
Copying file from local to server via SSH:
scp /path/to/source-file user@host:/path/to/destination-folder/
More commands found here.
Opening ROS serial node (defaults to port /dev/ttyUSB0):
rosrun rosserial_python serial_node.py _port:=/dev/ttyUSB0
Send ROS message to node:
rostopic pub /topic_name std_msgs/String hello
Full wiki page.
Create/merge new Git branch:
git checkout -b newbranch
git merge newbranch
Excluding packages from catkin_make:
# "List of ';' separated packages to build"
catkin_make -DCATKIN_BLACKLIST_PACKAGES="foo;bar"
Compiling threaded C++ code:
g++ foo.cpp -o foo -pthread -std=c++11
Finding custom libraries when compiling C++:
g++ laser_calibrate.cpp $(pkg-config --libs opencv) -o calib
Force uninstall apt packages via dpkg:
sudo dpkg --force-all -P
Installing sublime or other packages w/ custom executable:
sudo mv Sublime\ Text\ 2/ /opt/
sudo ln -s /opt/Sublime\ Text\ 2/sublime_text /usr/bin/sublime
Useful Links:
WordPress SSH commands
MX-64 Docpage