mysql.sock is a fifo file. It is essentially a bidirectional pipe "|" that exists as a file so that processes can talk to eachother without going to all the trouble of using network sockets.
see the options for mkfifo. on my system the file is:
srwxrwxrwx mysql mysql
Also note that you should double check /etc/services and make sure mysql is listed in there (default port 3306).


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