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# First, install all of the things

sudo su
apt-get update
apt-get install nginx
/etc/init.d/nginx start
sudo apt-get install python-dev
sudo apt-get install python-pip
sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu xenial-security main"
sudo apt update

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# login with cli
psql -U username
example: psql -U postgres

# see available databases list
\l

# see available tables
\dt

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#clear linux cache 
sync ; echo 3 | sudo tee /proc/sys/vm/drop_caches

# download all bangla font in linux
wget --no-check-certificate https://raw.githubusercontent.com/fahadahammed/linux-bangla-fonts/master/font.sh -O font.sh;chmod +x font.sh;bash font.sh;rm font.sh

# remove nginx cache
sudo rm -rf /var/cache/nginx/*

# without pass sudoer user