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Command Line Music player in mac os x

The Mac OS X provides a command line music player if you do not want to use iTunes or any other music player, which is very easy to use. Just supply the music file (such as mp3,wma , etc) located in a directory "afplay" command as below.

afplay  /Users/user/Music/yourmusic.mp3

afplay -h    will give you all the other options available with the command.

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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}'

How to boot into recovery mode on mac without holding Command + R Key on keyboard ?

Generally well known method to boot the mac into recovery mode is by holding the Command + R on keyboard while mac is turned on. However you can force the mac to boot into recovery mode upon next reboot by changing the nvram setting. To do that, Run below command.  

sudo nvram "recovery-boot-mode=unused" sudo reboot