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how to check whether Virtualbox Guest Additions have been installed on CentOS or any linux distro for that matter ?

I have a few Linux based VMs in Virtualbox and have forgotten whether I had installed Guest additions or not :-)

Would be grateful. Kind Regards

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up vote 1 down vote accepted

ps -A

Look for instances of "VBoxClient" (may be a few).

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Thank you for the answer, is there a way I can sort the output of that command alphabetically ? I have tried ps -A | grep "VB" - still learning the command line :-) - thanks again ! – rihatum Oct 29 '10 at 9:49
ps -A | grep "VBoxService" - should bring it down to a single "hit." – user48838 Oct 29 '10 at 17:33

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