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hi guys, when i type cat /etc/group

some of the lines has this:

users:x:100: - means what?

postfix:!:51: - means what?

root:x:0:administrator - means what?

nogroup:x:65534:nobody - means what?

appreciate for any inputs that will help to shed a light.

thanks in advance.

From a quick google search for /etc/group I can pass off this link to you
http://www.cyberciti.biz/faq/underst...etcgroup-file/

A simple search would turn up things like this which answer your question. Searching LQ and searching the web should always be the first step in answering your questions.
http://www.cyberciti.biz/faq/underst...etcgroup-file/
jdk

@spazticclown - Great minds think alike. ;)
jdk

@jdkaye yes, yes they do. :hattip:

Thank you guys, I always do Googling, but when I came across with this questions.
The first thing that comes to my mind was LQ.

anyway thank you guys for the help, i also find this link quite helpful:

http://pic.dhe.ibm.com/infocenter/ai...p_security.htm