Clone github repository with raspberry pi

Problem:
You are iterested to use a custom development from a github repository in your raspberry pi, after this clone process you can sync your raspberry with the new development.

Solution:

First, install GIT on raspbian:
sudo apt update
sudo apt install git
git --version
Follo the next steps:
1.- git clone https://github.com/raspberrypi/userland.git
2.- cd userland/host_applications/linux/apps/raspicam/
3.- time userland/build/bin/RaspiStill --exposure verylong --shutter 140
00000 -t 16000 -o test.jpg

Examble:
This git is to change functionality of raspberry pi camera, in this case you can get more exposure time.