Adding UNIX user to a group

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# 1  
Old 01-30-2014
Adding UNIX user to a group


I am new to unix. I am facing access permission issue

I want to access path
/app/compress from a user "test" but getting permission denied error

This path exist in "Main" user
So after some googling i came to know we need to add "test" user in "main" group
so path /app/compress will be accessible from "test" user as well.

How to add "test" user in "main" group
Could anyone please help on this.

# 2  
Old 01-30-2014
What is your system? User management is one thing that differs a lot between different UNIX systems. uname -a
# 3  
Old 01-30-2014
As corona688 asked, what is the UNIX system type.

But, general UNIX command is
usermod -G <new secondary group> username
usermod -G main test   (where main is secondary group and test is user)

Hope this helps.
# 4  
Old 01-30-2014
When using usermod, be careful to list ALL old groups of that user, too, else they will be gone!
# 5  
Old 01-30-2014
Holy Moly!

I thought I mentioned it, thanks RudiC.
# 6  
Old 01-30-2014
Originally Posted by RudiC
When using usermod, be careful to list ALL old groups of that user, too, else they will be gone!
Unless you use the -a flag too: usermod -aG <groups> user
# 7  
Old 01-31-2014

Thanks for your answers I did
uname -a

below is the output

Linux XXXXXXXX 2.6.18-238.el5 #1 SMP Tue Jan 4 15:41:11 EST 2011 x86_64 x86_64 x86_64 GNU/Linux

Could you please advise now needed it urgently now
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