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get rospy.Time

now = rospy.Time.now()
now = rospy.get_rostime()
rospy.loginfo("Current time %i %i", now.secs, now.nsecs)

get time in seconds

now = rospy.get_time()

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ffmpeg -ss 61.0 -t 2.5 -i StickAround.mp4 -f gif StickAround.gif

-ss 61.0 seek to 61.0 seconds
-t 2.5 only read 2.5 then stop

ffmpeg -ss 61.0 -t 2.5 -i StickAround.mp4 -filter_complex "[0:v] fps=12,scale=480:-1,split [a][b];[a] palettegen [p];[b][p] paletteuse" SmallerStickAround.gif

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convert -coalesce something.gif something.png

or

magick convert -coalesce something.gif something.png

the speed could be known using :

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interactive terminal :

aspell -t -c file.tex

list of misspelled words :

cat file.tex | aspell list -t | sort | uniq

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from subprocess import call
from time import sleep
from datetime import datetime
import argparse

if __name__ == '__main__' :
    parser = argparse.ArgumentParser(progname='python vol-ctrl.py', description='decrease volume with delay')
    parser.add_argument('-i','--init',type=int,help='initial volume')
    parser.add_argument('-r','--rate',type=int,help='decrease rate')
    parser.add_argument('-d','--delay',type=int,help='decrease delay in seconds')

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# start the ssh-agent in the background
$ eval "$(ssh-agent -s)"
# add key
$ ssh-add
# list key
$ ssh-add -l

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• optional, if with initializer

https://stackoverflow.com/questions/39599242/in-c17-can-an-if-statement-with-an-initializer-be-used-to-unpack-an-optional

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Docker Cheat Sheet

## List Docker CLI commands
docker
docker container --help

## Display Docker version and info
docker --version
docker version
docker info

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docker ...
  -e DISPLAY=$DISPLAY \
  -v /tmp/.X11-unix:/tmp/.X11-unix \

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namespace traits {

    template <typename T, typename = void>
    struct is_std_array : std::false_type {};
    template <typename T>
    struct is_std_array<T,std::enable_if_t<
        std::is_same_v<std::array<typename T::value_type, std::tuple_size<T>::value>, T>
    > > : std::true_type {};