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Changing the 'default' group when creating files

When a user is a member of more than 1 group, which setting determines what group is used when creating files and directories?
Ex.: user A is member of the groups 'cats' and 'dogs'. When he creates a file, user A is the owner, and per default, 'cats' is used as the owning group. 'cats' is always used. How can I change this to always being 'dogs' instead?
Thanks for your time :)

Try

Code:

usermod -g dogs <username>

It is the main (primary) group for the user. You can temporarily switch the primary group to one of the auxiliary groups using the sg command in terminal, in much the same way that you can switch to another user using su. For example:

Code:

% groups

matthew adm dialout cdrom floppy audio dip video plugdev scanner fuse lpadmin admin netdev powerdev

% touch file1

% sg adm

% touch file2

% exit

% touch file3

% ls -l file?

-rw-r--r-- 1 matthew matthew 0 2007-10-27 22:49 file1

-rw-r--r-- 1 matthew adm    0 2007-10-27 22:50 file2

-rw-r--r-- 1 matthew matthew 0 2007-10-27 22:50 file3

Quote:

Originally Posted by saikee (Post 2939101)

Try

Code:

usermod -g dogs <username>

That did it, thanks a lot!