gistfile1.txt

# Total number of minions registered: 15. Looks good:
[0 root@bellerophon ~] salt --out=raw -C '*' grains.item os|wc -l
15

# Positive matches against the OS work nicely, and their sum equals the number 15 above:
[0 root@bellerophon ~] salt --out=raw -C '* and G@os:Ubuntu' grains.item os|wc -l
9
[0 root@bellerophon ~] salt --out=raw -C '* and G@os:Univention' grains.item os|wc -l
4
[0 root@bellerophon ~] salt --out=raw -C '* and G@os:CentOS' grains.item os|wc -l
2

# »not CentOS« should logically be all Univention and all Ubuntu
# minions = 13, but it's not:
[0 root@bellerophon ~] salt --out=raw -C '* and not G@os:CentOS' grains.item os|wc -l
9