How to delete old files.

We can deleted older files more than 10 days or older 5 minutes.
Ex:
First we need to fine files older than 10 day :
$find /PATH/* -mtime +10

Second we nedd to fine files older than 5 minutes and delete it:
$find /PATH/* -mmin +5 -exec rm {} \;

How to dump Mysql

We can use command for dump mysql on linux
Ex:
$mysqldump -uroot -p'xxxxx' databasename > /PATH/databasename.sql

-u is mean user
-p is mean password
databasename mean databese for need to dump

Restore database:
Ex:
$ mysql -uroot -p'xxxx' databasename < /PATH/databasename.sql