Reverse sort 3rd numeric column in file

In bash shell scripting, I have users.txt file.

sort -t: -k 3n users.txt gives me

gg:g@g.g:
ff:f@f.f:5
gdr:[e-mail]:5
g:[e-mail]:8
r:[e-mail]:85
qaws:[e-mail]:789
qaz:[e-mail]:789
vcf:[e-mail]:855
op:[e-mail]:6465
zx:[e-mail]:7845
az:[e-mail]:7894
w:[e-mail]:7894
h:[e-mail]:7899
lp:[e-mail]:8888
t:[e-mail]:85474
dssdfsdf:[e-mail]:654654
u:[e-mail]:6546546
a:[e-mail]:7894561
tt:t@t.t:1234567890

This is ok. But I need 3rd column which contain only phone number in reverse order i.e. descending order. How to achieve that?

I need like

tt:t@t.t:1234567890
a:[e-mail]:7894561
u:[e-mail]:6546546
dssdfsdf:[e-mail]:654654
t:[e-mail]:85474
lp:[e-mail]:8888
and so on...

Answer

You could add an r (short for “reverse”) to the order column specification:

$ sort -t: -k 3nr  users.txt
# Here ---------^