Assume a script runs on boot as root. From this script I want to start
tcpsvd -E 0 515 lpd. I want
tcpsvd to run as an unprivileged user. But it requires root privileges to bind to the port 515. How can I achieve this?
Further I have to use
tcpsvd tcpsvd [-hEv] [-c N] [-C N[:MSG]] [-b N] [-u USER] [-l NAME] IP PORT PROG Create TCP socket, bind to IP:PORT and listen for incoming connection. Run PROG for each connection. IP IP to listen on. '0' = all PORT Port to listen on PROG [ARGS] Program to run -l NAME Local hostname (else looks up local hostname in DNS) -u USER[:GRP] Change to user/group after bind -c N Handle up to N connections simultaneously -b N Allow a backlog of approximately N TCP SYNs -C N[:MSG] Allow only up to N connections from the same IP New connections from this IP address are closed immediately. MSG is written to the peer before close -h Look up peer's hostname -E Do not set up environment variables -v Verbose