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to make an .sh script to run under linux.
It would listen to a port, and once a connection has been established, saved the messages to a file.
sorry for not clarifying my question.
No, that part was clear...you want to "make a script". What are you looking for US to tell YOU? How to write it? What to write it in? A shell script isn't what you'd want to do TCP/IP socket programming with as a rule. C/Perl/Ruby are better choices.
But since you don't say what OS or platform you want to use, what kind of data over what port to listen to, or give any details other than you want to "make a script", not sure what else to tell you.
You should Google for sample code. Wrox Publishing has a very good book about Linux programming, and they have a very simple client-server development code - they usually have sample code available for download.
You will certainly need some compiled program to act as the server, coded in C/C++ or something similar. I don't doubt that creating a server as a bash script is possible, but it's certainly an awful lot of work and full of ugly hacks, just to do something that is quite easy to do in C/C++.
You can always take a look at netcat, and do something like
while true ; do
netcat -l -p 5555 >> stuff.log
Connect to port 5555 (with netcat or telnet or whatever) and write some stuff and it will end up in stuff.log. The loop is necessary since netcat will exit once the client disconnects. This will also only allow one connection at any time, so it's kind of limited...