How to check on which port MySQL is running?

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Sometimes, the question bothers that what is the port on which MySQL is running. The thing is, it is all stored inside a table in MySQL. You just need to fire a query to find out.

$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 101
Server version: 5.6.19-0ubuntu0.14.04.1 (Ubuntu)

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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show global variables like 'port';
| Variable_name | Value |
| port          | 3306  |
1 row in set (0.00 sec)