Coding a backdoor

I'd like to drop a backdoor in an addon that will print certain information into my console when I run a script.

I need to read the contents of sv_config.lua

I was thinking just doing

print( file.Read( "sv_config.lua", "LUA") );

somewhere in the code for the addon but I figured that would just print it to the server's console, not my console. So I need some more help.

Maybe a clientside lua file I can use to access a backdoor I put in the addon.

Need some more specific help- this backdoor is for a specific server and I will only use it on one server.

wiki.garrysmod.com/page/Category:net
wiki.garrysmod.com/page/Global/RunString

I need a little more help than that- while these links are great and have helped me learn a lot, I don't know how to put them in context.