How to check whether particular port is open or closed on UNIX

Question

I am very new to unix  How can I check that a particular port is free or used right now

User · Answer

Try  maybe as root   lsof -i -P   and grep the output for the port you are looking for   For example to check for port 80 do  lsof -i -P   grep  80

User · Answer

netstat -ano grep 443 grep LISTEN   will tell you whether a process is listening on port 443  you might have to replace LISTEN with a string in your language  though  depending on your system settings

[unix] How to check whether particular port is open or closed on UNIX?

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