Whenever I start my bash shell I get this annoying message.

Your group is currently “mkgroup”.  This indicates that
the /etc/group (and possibly /etc/passwd) files should be rebuilt.
See the man pages for mkpasswd and mkgroup then, for example, run
mkpasswd -l [-d] > /etc/passwd
mkgroup  -l [-d] > /etc/group
Note that the -d switch is necessary for domain users.

I tried doing what the documentation but I still kept getting that message.  I then tried one of the suggestions in the comments of this post, Cygwin users and groups « sinewalker.

$ mkpasswd -l -p /home/ -c > /etc/passwd

$ mkgroup -l -c> /etc/group

I then got this message.

Copying skeleton files.
These files are for the user to personalise
their cygwin experience.

These will never be overwritten.

`./.bashrc’ -> `/home/fkim//.bashrc’
`./.bash_profile’ -> `/home/fkim//.bash_profile’
`./.inputrc’ -> `/home/fkim//.inputrc’
Your group name is currently “mkgroup_l_d”. This indicates that not
all domain users and groups are listed in the /etc/passwd and
/etc/group files.
See the man pages for mkpasswd and mkgroup then, for example, run
mkpasswd -l -d > /etc/passwd
mkgroup  -l -d > /etc/group

This message is only displayed once (unless you recreate /etc/group)
and can be safely ignored.

I am not sure what it means but it was only displayed once.  Now that I am not seeing it anymore I’m happy. 🙂