Error in mysql shell script, 'Database: command not found'

Question

I am getting the following error while trying to execute this command:

Command:

$(mysql -u root -proot -e 'show databases;') > dbnames

Error:

Database: command not found

Answer 1

$( mysql -u ... ) evaluates to the result of the mysql command. In this example, that string is then treated as a command to execute, and so equivalent to trying to run

$ Databases > dbnames
Databases: command not found

You simply want to execute the mysql command:

mysql -u root -proot -e 'show databases;' > dbnames