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Simple TCPDUMP grepping for common unsafe protocols (HTTP, POP3, SMTP, FTP)
Require lftp and this script to work (adapt path and credentials as needed):
echo $'#!/bin/bash\n# coded by sputnick under GPL 20101007\nlftp -u user,passwd firstname.lastname@example.org -e "$(cat)"' > /PATH/TO/ftp-latest; chmod +x !$
By putting ! in front of a command, we are able to run it from an ftp session.