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How to enable root login in gnome on Debian 6 or 7

Root user login in gnome is disabled on Debian system by default for security reasons. If you want to enable it for specific reasons then follow the below steps : 1. Login into Debian system 2. launch the Root Terminal from Applications -> Accessories. 3. Authenticate with password to launch the Root Terminal. 4. Open "/etc/pam.d/gdm3" with vi.          #vi /etc/pam.d/gdm3 5. Look for "auth     required     pam_succeed_if.so  user  != root   quiet_success"  , comment it out as below.     #auth     required     pam_succeed_if.so  user  != root   quiet_success 6. Save the modification with Esc+w+q+Enter keystroke. 7. Restart or reboot Debian system. 8. Login with root user in gnome. You should be now able to login successfully.   
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How to disable USB ports on Mac OS X Mavericks, Yosemite or El Capitan ?

We might wonder how to disable the USB ports on Mac to prevent data copy to external USB mass storage devices. The USB kext on os x is loaded at the time of start of the system, this can be loaded / unloaded using kextload or kextunload command. To disable USB port on Mac , follow below steps: On Macs running  Mountain Lion, Mavericks  and Yosemite : Unmount any connected USB devices to the system by running below command                  $ diskutil unmount /Volumes/USBDISK. Now unload the USB related kernel extensions in the following order using kextunload command.             sudo kextunload -b com.apple.driver.AppleUSBCardReader             sudo kextunload -b com.apple.driver.AppleUSBODD             sudo kextunload -b com.apple.iokit.IOUSBMassStorageClass        This wil...
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What are the useful nvram settings in macOS ?

The OS X boot arguments are useful for troubleshooting problems with system startup and how the system behaves when running. sudo nvram boot-args="-v" :  This command will set the system to always boot to verbose mode, so we do not need to hold Command + V at system startup. sudo nvram boot-args="-x" :  This will set the system to always boot into Safe Mode. sudo nvram boot-args="-s" :  This command will boot the system into single user mode without needing to hold Command-S at system startup. sudo nvram boot-args="iog=0x0"  :   when you close the display but connect the system to an external monitor and keyboard the system will stay awake. After running this command, when connecting an external monitor, the internal display will be disabled, which can be beneficial in some situations such as those where you are mirroring your desktop but wish to run the external display at a higher resolution than your laptop can run. sudo nvram b...
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