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I have a configuration file which is a simple text. I want to list some configuration line but except some sitring. How can I use Linux grep to exclude and search for given strings? Thanks in advance for your help!

How can I define multiline string Python and print to the screen? Thanks in advance for your help!

I have installed the an application which will work over the network. I can not connect this application from other computers. I need to open some port on windows firewall. How can I find this application listening port?