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I am getting the databases from mysql and my database name is username_something. I am getting the username and then puting the respective backups in corresponding folders like

tar bala bla  /backups/sql/username/username_something.tar.sql.gz

The problem is system worrks if i have the folder username already there but for new databases if get the error like unknown file path.

How can i do that if username folder is not there it should be created

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You can use mkdir before the tar command to create the directory. If multiple dirs in the path may be missing, you can use the -p flag. Using -p will also suppress the error if the directory already exists.

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mkdir -p /backups/sql/username && tar ...

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