Sam Pfeiffer awesomebytes

Show top processes only by name

top -c -p $(pgrep -d',' -f NAME)

How to open Visual Studio Code via command line

In order to open a Visual Studio Code sometimes we want to do it from the command line. Either because that allows us to just open the current file or folder, or because we would like to script opening some specific resource. This resource may be placed in another machine (e.g. via ssh), or in a docker container (running in the same machine or in another machine).

Local file or folder

code <file or folder>
# e.g. code .

To visualize a custom AprilTags description

In python/ipython 2.7

custom_apriltag_string = "wwwwwwwwwbbbbbbwwbddddbwwbddddbwwbddddbwwbddddbwwbbbbbbwwwwwwwww"
for idx, c in enumerate(custom_apriltag_string):
    if idx % 8 == 0 and idx > 0:
        print
    print c,

How to create a GIF from a video

ffmpeg -i video.mp4 -r 15 -vf "scale=512:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -ss 00:00:03 -to 00:00:09 video.gif

From https://askubuntu.com/questions/648603/how-to-create-an-animated-gif-from-mp4-video-via-command-line

-i video.mp4 is the input video.
-r 15 is the FPS, 10 or 15 is usually fine, more would be too big of a file.
-vf "scale=512:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse optimizes the palette of colors of the gif and sets the scale (512px here, use 768 if you need it a bit bigger, but be aware of the final size of the gif if you do so, 512 is a good tradeoff).

	#!/usr/bin/env python
	import sys
	import numpy as np
	import cv2
	import rospy
	from cv_bridge import CvBridge, CvBridgeError
	from sensor_msgs.msg import CameraInfo, Image, CompressedImage

	"""
	Publish a default CameraInfo topic from an Image or CompressedImage topic

	#!/usr/bin/env python3
	import sys
	import argparse
	import os
	import subprocess
	import signal
	import time
	import threading
	import shlex
	import docker

	#/usr/bin/env python
	import socket
	import time
	from multiprocessing import Process, Queue

	def check_server(address, queue, port=11311):
	# Create a TCP socket
	s = socket.socket()
	try:
	s.connect((address, port))

	# this is part of .bashrc / .bash_profile
	if [[ $(ps aux \| grep bin/roscore \| grep -v grep) ]]; then
	export ROS_MASTER_URI=`python -c "import rosgraph; print(rosgraph.Master('ip_checker').getUri())"`
	export ROS_IP=`python -c "import rosgraph; print(rosgraph.Master('ip_checker').getUri().replace('http://','').replace(':11311/',''))"`
	export ROS_NETWORK_INTERFACE=`ifconfig \| grep $ROS_IP -1 \| awk 'NR==1{print $1}' \| sed 's/://g'`
	else
	echo "No roscore found, setting ROS_MASTER_URI and ROS_IP to localhost defaults."
	export ROS_MASTER_URI=http://localhost:11311
	export ROS_IP=127.0.0.1
	export ROS_NETWORK_INTERFACE=lo