fixing users and groups

The default install of cygwin may not correctly build your group and passwd files, especially if you are on a domain. Use these commands to backup your originals, and create proper files from your domain:

cp /etc/passwd /etc/passwd.bak
cp /etc/group /etc/group.bak
mkpasswd -l -d > /etc/passwd
mkgroup  -l -d > /etc/group