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How to permanently boot mac os x in verbose mode

We can make  mac to boot in verbose mode permanently  (i.e, show all log messages during boot) by setting the "nvram" variable in terminal. 
$ sudo nvram boot-args="-v"

This will set the mac to show verbose messages when every time mac os  x boots.


To reset back again,  run :

$ sudo nvram boot-args=


Note : If you want to see the verbose messages for momentarily then hold " Command+V " during the mac booting immediately after mac starts booting

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