shell - How to pass password from file to mysql command? -

i have shell script calls mysql command 1 parameter external file, looks (also saw example in other resources):

mysql --user=root --password=`cat /root/.mysql`

bit not working:

failed connect mysql server: access denied user 'root'@'localhost' (using password: yes).

i tried different quotes without success. how pass it?

update 1: found can pass password without space symbol. problem in this, root pass contains spaces.

finally line working:

 mysql --user=root --password="$(cat /root/.mysql)"

or:

mysql --user=root --password="$(< /root/.mysql)"

root password must without quotes: bla bla bla

if password not contains spaces can use:

mysql --user=root --password=`cat /root/.mysql`

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