Add linux notes

linux/linux_general.txt

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+wifi:
+https://raspberrypi.stackexchange.com/questions/109425/ubuntu-server-18-wifi-hotspot-setup

linux/linux_users.txt

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+adduser oleg20111511
+sudo usermod -a -G sudo oleg20111511
+
+ssh-copy-id
+
+chgrp oleg20111511 /var/www

linux/mysql_commands.txt

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+install:
+sudo apt install mysql-server
+sudo apt install libmysqlclient-dev
+
+user creation:
+CREATE USER 'socialstore' IDENTIFIED BY 'socialstorepassword';
+SELECT user FROM mysql.user;
+
+database creation:
+CREATE DATABASE StoreDatabase;
+GRANT ALL PRIVILEGES ON StoreDatabase.* TO socialstore;
+
+database management:
+USE StoreDatabase;
+SHOW TABLES;
+
+installation:
+

linux/postgres_commands.txt

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+Start:
+su postgres
+psql
+
+Show databases:
+\l
+
+Switch to database:
+\c [name]
+
+Show tables
+\dt
+
+Create new database and user:
+create database mydb;
+create user myuser with encrypted password 'mypass';
+grant all privileges on database mydb to myuser;