How to Disable the Camera on a Macbook

Click on the 'Spotlight' search icon in the top right of the OS X screen. The icon is a 'magnifying glass.' In the search box, type in 'Terminal.' Wait for the results to load and click on 'Terminal' from the list of results.
Type the following into the 'Terminal' prompt (note the space between 'mkdir' and the '/') and press 'Enter.''mkdir /System/Library/QuickTime/.iSightBackup'
Type the following command into the 'Terminal' prompt (note the space between 'mv' and the '/') and press 'Enter.''mv /System/Library/QuickTime/QuickTimeUSBVDCDIgitizer.component /System/Library/QuickTime/.iSightBackup/'
Click the small red 'X' icon in the top left corner of the Terminal to exit. The camera is now disabled.
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How to Unblock Sites Using the Terminal Mac OS X Application for MacBook

Click the 'Finder' icon on the dock at the bottom of the screen.
Click 'Applications' at the left side of the Finder window, double-click the 'Utilities' folder and double-click 'Terminal.'
Type 'sudo nano /private/etc/hosts' into the terminal window and press 'Enter' to open the hosts file in a terminal text editor.
Use the arrow keys to locate the line referring to the blocked website in the text editor.
Position the text cursor at the beginning of the line.
Type a '#' character to comment out the line. The system ignores any lines in configuration files that begin with the '#' character.
Press 'Ctrl+O' and then press 'Enter' to save the file.
Press 'Ctrl+X' to close Nano, then close the terminal window.
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How to Change the Process Priority on a Mac (5 Steps)

Click 'Applications' on the Dock, then 'Utilities.' Click 'Activity Monitor.' Leave this application open.
Click 'Applications' on the Dock, then 'Utilities.' Click 'Terminal.'
Check in Activity Monitor for the process you want to change. Each process is assigned an ID, the PID (process ID). Make a note of the PID.
Switch back to Terminal.
Type 'nice +20 -p 0000' (without quotes). Replace the '+20' with a value between '+20' and '-20.' -20 is the highest priority item and +20 is the lowest priority item. The '-p' parameter determines to affect a process. Replace '0000' with the process ID (PID) for your process. Press 'Enter.'
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