How to find out that there was an sftp login?

Question

linux

Good day!
Apparently I forgot how to google.

to find out who is logged in via ssh, you can run w who or last commands for example.
But how can I find out who is currently connected via sftp?

found only
ss -e | grep -i ssh

but it shows not even connected users, but simply with an open login window.

Answer 1

netstat -atn | grep ':22'