If you have installed MySQL on your Mac and forgot your root password, these instructions are for you.

To shutdown:

sudo shutdown -h now

To restart

sudo shutdown -r now

The Mac OS keyboard does not have a print screen button. So this is how to capture your screen on Mac:

• Hold down Apple key ? + Shift + 3 and release all

The screen shot would appear on your desktop.

You can also do a screen capture for a portion of your screen.

• Hold down Apple key ? + Shift + 4 and release all key
• Mouse cursor would change to +
• Select the region you wish to capture

Easy.

It is now common for users to work with multiple monitors. Laptop users, especially, prefer to work on their laptop screen and an external monitor when at they at work or at home. If you are using netflix or some other service to download movies, you would prefer to watch it on large screen rather than your laptop screen, so you would want to connect your computer to a TV or projector.

It is very easy to connect Mac OS computers to external monitors.

Homebrew is a package manager for Mac OS.

Installation

1. Download and install Xcode from Mac store if you don't already have it installed

2. In a terminal, type the following code

   xcode-select --install
   

3. Run the following command

   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"    
   

Some commands

brew search Search for an application:

Problem

Mac terminal shows the wrong hostname on prompt.

Solution

Find out if a hostname is already specified.

$ sudo scutil --get HostName
HostName: not set

To set your Hostname

$ sudo scutil --set HostName 'myname'

Exit out of your terminal and start a new terminal. You should see your chosen hostname.

A version control system keeps track of changes in code. It keeps track of every change made by every developer. It allows code bases to be branched and then merged back. You can also go back in time to a point before you introduced something in the code. Version control is absolutely essential for software development.

Your host file enables your system to override the DNS setting for a domain. This change only affects your system.

The syntax of a host file entry is as follows

# this is a comment
192.168.22.22 molecularsciences.org

Basically you specify an IP followed by a domain. All lines beginning with # sign are comments.

Host files should only be edited with plain text editors like notepad, notepad++, sublime, etc. Following are the locations of host files on different systems: