$ cat foo.php | grep '$dbpwd=' | cut -d '"' -f 2 | mysql -U root -p mydb -h friendserver
Enter password: (holds)

$ echo P455w0rd | mysql -u root -p mydb -h friendserver
Enter password: (holds)

[client]
user=foo
password=P@55w0rd

mysql --defaults-extra-file=<path to the new config file> [all my other options]

MYSQLPASS=`cat foo.php | grep '$dbpwd=' | cut -d '"' -f 2`

mysql -U root -p ${MYSQLPASS} mydb -h friendserver