How do I verify the permissions on the '/tmp/mysql.sock' file?

Use the `ls -l /tmp/mysql.sock` command in a terminal. The output will show the file's permissions and owner. Ensure the user running the MySQL client application has read and write permissions. If permissions are incorrect, use the `chown` and `chmod` commands to modify them accordingly. For example, `sudo chown mysql:mysql /tmp/mysql.sock` and `sudo chmod 660 /tmp/mysql.sock` (assuming the MySQL user is 'mysql').