Check out example codes for "mysqldump password". It will help you in understanding the concepts better.

Code Example 1

add this to .my.cnf file
user can be omitted

[mysqldump]
user=mysqluser
password=secret

The -p option must be excluded from the command in order to use the password in the config file.
Correct:
mysqldump –u my_username my_db > my_db.sql
Wrong:
mysqldump –u my_username -p my_db > my_db.sql

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