tmsh/bigpipe command to display version

Wouldn't that be tmsh show /sys version? Though that may have been changed lately. You could also do tmsh list /sys software or tmsh show /sys software to see what is installed.

b version

tmsh show sys version

tmsh show sys version | head

spares you all the clutter of IDs included if you are running a hotfix :)

tmsh show sys version

In unix mode(Bash) you can fire below command to check version.

cat /VERSION