Add linux notes

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;