using vsftpd, and I personally use this, you can track active connections by adding these lines on your config file:
setproctitle_enable=YES
session_support=YES
Then you may able to monitor who are connected by:
Quote:
watch -n 1 "ps ax | grep [v]sftpd"
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Using pureftp, you can use pure-ftpwho.
Using proftpd, you can use ftpwho and ftptop.