Added commands file with instructions for setting up new user with PostgreSQL

Author: Benjamin

section9/lectures/137_creating_a_unix_user_in_ubuntu_16/commands.md

@@ -6,7 +6,7 @@ To create a new user, run the following command and enter the user details as pr
 adduser jose
 ```
 
-# Add the new user to sudo users
+### Add the new user to sudo users
 
 Running the visudo command will open a file (normally located at /etc/sudoers). 
 ```bash
@@ -21,7 +21,7 @@ jose ALL=(ALL:ALL) ALL
 
 Save the file with CNTR+O and press enter to save it. Then CNTR+X to exit the file.
 
-# To enable logging in to the server as the newly created user, enable password login to the server by running
+### To enable logging in to the server as the newly created user, enable password login to the server by running
 
 ```bash
 vi /etc/ssh/sshd_config

section9/lectures/138_setting_up_our_new_user_with_postgreSQL_permissions/commands.md

@@ -0,0 +1,37 @@
+## Set up New User with PostgreSQL Permissions
+This section assumes you created a new unix user in Ubuntu 16.04 (instructions in the previous lecture) and you are logged into the server as the new user.
+
+To become the postgres user, run
+
+```bash
+sudo su
+sudo -i -u postgres
+```
+
+To create a postgres user, run the following command. Note, the user must have the same name as the unix user logged into the server ("jose" in our case).
+
+```bash
+createuser jose -P
+```
+
+You will prompted twice to set the password for the new postgres user.
+
+To create a database, run
+
+```bash
+createdb jose
+```
+
+To enforce password login to PostgreSQL with user jose, run the following commands. Note 9.5 is the PostgreSQL version installed in your server. Later this version may change so make sure to change your accordingly.
+
+```bash
+vi /etc/postgresql/9.5/main/pg_hba.conf
+```
+
+Scroll down to the bottom and change "peer" to "md5" in the following line under '# "local" is for unix domain socket connections only comment'. This is how the line should look after changing.
+
+```bash
+local all all md5
+```
+
+Finally, write and quit.