1. Create a log file, for example /var/log/cxs.log, and chmod it 666.
2. Edit the files /etc/cxs/cxsftp.sh and /etc/cxs/cxscgi.sh and add the following to the command line:
--logfile /var/log/cxs.log
If you want to enable logging for all file uploads, including non-suspicious files (this really should only be done during testing), add the option --cleanlog to your command line.
3. To "watch" the logfile while you are testing, run the following command in ssh:
tail -f /var/log/cxs.log
(Replace /var/log/cxs.log with the full path and filename of your own logfile if you are using something different.)