New answers tagged application
I'm not certain what you are looking for, but you can build simple services using socat to listen on a port and get it to run a shell script for example on each connection. You can limit the max simultaneous connections. Eg create a bash script ./myscript holding: #!/bin/bash read message echo "hello. got $message" sleep 10 echo "bye" Then launch socat on ...
Traditionally, inetd(8). Most Linux distributions package xinetd.
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