Add Find The Process Using A Specific Port as a mac til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_700 TILs and counting..._
+_701 TILs and counting..._
 
 ---
 
@@ -292,6 +292,7 @@ _700 TILs and counting..._
 - [Default Screenshot Location](mac/default-screenshot-location.md)
 - [Disable Swipe Navigation For A Specific App](mac/disable-swipe-navigation-for-a-specific-app.md)
 - [Display A Message With Alfred](mac/display-a-message-with-alfred.md)
+- [Find The Process Using A Specific Port](mac/find-the-process-using-a-specific-port.md)
 - [Insert A Non-Breaking Space Character](mac/insert-a-non-breaking-space-character.md)
 - [List All The Say Voices](mac/list-all-the-say-voices.md)
 - [Require Additional JS Libraries In Postman](mac/require-additional-js-libraries-in-postman.md)

mac/find-the-process-using-a-specific-port.md

@@ -0,0 +1,15 @@
+# Find The Process Using A Specific Port
+
+The `netstat` utility is often recommended for finding the PID (process ID)
+bound to a specific port. Unfortunately, Mac's version of netstat does not
+support the `-p` (process) flag. Instead, you'll want to use the `lsof`
+utility.
+
+```bash
+$ sudo lsof -i tcp:4567
+```
+
+Running this will produce a nicely formatted response that tells you several
+pieces of information about the process bound to `:4567` including the PID.
+
+[source](https://stackoverflow.com/questions/3855127/find-and-kill-process-locking-port-3000-on-mac)