diff --git a/linux/linux_general.txt b/linux/linux_general.txt
new file mode 100755
index 0000000..abc9043
--- /dev/null
+++ b/linux/linux_general.txt
@@ -0,0 +1,2 @@
+wifi:
+https://raspberrypi.stackexchange.com/questions/109425/ubuntu-server-18-wifi-hotspot-setup
diff --git a/linux/linux_users.txt b/linux/linux_users.txt
new file mode 100755
index 0000000..63a9845
--- /dev/null
+++ b/linux/linux_users.txt
@@ -0,0 +1,6 @@
+adduser oleg20111511
+sudo usermod -a -G sudo oleg20111511
+
+ssh-copy-id
+
+chgrp oleg20111511 /var/www
diff --git a/linux/mysql_commands.txt b/linux/mysql_commands.txt
new file mode 100755
index 0000000..ffc244e
--- /dev/null
+++ b/linux/mysql_commands.txt
@@ -0,0 +1,18 @@
+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:
+
diff --git a/linux/postgres_commands.txt b/linux/postgres_commands.txt
new file mode 100755
index 0000000..1e289a8
--- /dev/null
+++ b/linux/postgres_commands.txt
@@ -0,0 +1,17 @@
+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;