Backup all of mysql database

[sao sang mo]

hi,
I run below command to backup all of databases:

mysqldump -uadmin -p`cat /etc/psa/.psa.shadow` -all-databases > /root/all-database.sql

but get problem:

mysqldump: Got error: 1049: Unknown database '–all-databases' when selecting the database

How can i solve it?
thanks

 

[IgorG]

Read carefully help for mysqldump command. -all-databases is option but not name of database.

 

[sao sang mo]

I'm sorry, must be:

mysqldump -uadmin -p`cat /etc/psa/.psa.shadow` --all-databases > /root/all-database.sql

thank IgorG