Linux auto-login on MySQL

Create file  ~/.my.cnf  and add the following lines, replace mysqluser and mysqlpass values with the correct ones 
 [client]
user=mysqluser
password="mysqlpass" 
 For safety, make this file readable to you only by running  chmod 0600 ~/.my.cnf   
 Next time you run mysql commands mysql, mysqlcheck, mysqdump, etc; they will pick username & password from this file if you do not provide them as argument (-u and -p). It can save your time. 
 Of-course, if you specify username and password explicitly as part of commands arguments, they will be used. 
 https://easyengine.io/tutorials/mysql/mycnf-preference/