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# Rename a branch and delete remote old branch
git checkout <old_name>
git branch -m <new_name>
git push origin -u <new_name> # If the old branch is on remote
git push origin --delete <old_name> # If the old branch is on remote

# Revert to the state just before the last commit
git reset HEAD^
git reset 'HEAD@{1}' # revert last one

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Connect with command line

sudo -i -u postgres # change user 
psql # connect to postgresql

Commnands

# List all users

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# List proccess
ps aux

# journalctl logs
journalctl -u clinic_server.service --since "1 hour ago"
journalctl -u clinic_server.service --since "2 days ago"

# Find text in files in current dir recursively
grep -Ril "a_word" . --include \*.txt --exclude \*.ano --exclude-dir=site-packages

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sudo apt update
# Install JDK
sudo apt install python-software-properties
sudo add-apt-repository ppa:openjdk-r/ppa
sudo apt-get update
sudo apt install openjdk-11-jdk
sudo apt-get update
java -version

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Generate a new SSH key

ssh-keygen -t rsa -b 4096 -C "<mail_address>"

Add the key to the SSH agent:

ssh-agent bash # starts the SSH agent in backgroud

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Install Docker

sudo apt update
sudo apt install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
sudo apt-get update
sudo apt-get install docker-ce

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1. Install nginx RTMP module

sudo apt install libnginx-mod-rtmp

2. Add the following configuration to /etc/nginx/nginx.conf

rtmp {
        server {
                listen 1935;

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Cerbot with Nginx

More info here. Ensure you have server blocks for example.com and www.example.com, and that the port 443 is allowed through the firewall.

sudo add-apt-repository ppa:certbot/certbot
sudo apt install python-certbot-nginx
sudo certbot --nginx -d example.com -d www.example.com

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*filter

# Drop NULL packets
-A INPUT -p tcp --tcp-flags ALL NONE -j DROP

# Block syn flood attack
-A INPUT -p tcp ! --syn -m state --state NEW -j DROP

# Block XMAS packets

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Plugins

How to add an Android library to a plugin

Put the library files in a directory <plugin_root>/android/<lib_name>. Next, edit the file <plugin_root>/android/build.gradle:

dependencies {