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Resetting your lost/forgot password in Mac OS X

In case of you forgot your user password on Mac OS X, it is easy to reset. The below steps should help you in resetting your password

  1. Restart your Mac, and goto single user mode by holding ( Command + S ) button on your mac keyboard. Here command button is often referred as Apple button also.
  2. In the command prompt execute following commands
    1. #sh /etc/rc
    2. #passwd (username on your mac for which you want to change the password).
    3. #reboot
  3. Now login to mac in normal mode, use your changed password to login.
Note: All your Key chain stored password will be lost by following above steps.

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How to disable USB ports on Mac OS X Mavericks, Yosemite or El Capitan ?

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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
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On Mac running El Capitan:
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How to find firmware or boot ROM version in Mac OS X

Firmware and boot ROM version of your mac can be found in two ways.
Way 1 :
1. From "Apple" menu , choose "About This Mac" menu item. 2. Click " More Info " to open "System Profiler" application. 3. Under Contents -> Select Hardware Tree item.
On the right side panel Under hardware overview section, we can see Boot ROM Version and SMC (Firmware) Version.

Way 2 :
Run the below command in terminal to get boot ROM version and SMC(firmware) version :
$ system_profiler SPHardwareDataType | grep -i "Version" | awk -F ':' '{print $1 $2}'