How to backup & update Drupal using command line

1. backup core files:
   tar vcfz backup/pre-dup-update-7xx.tar.gz

tar -czvf name-of-archive.tar.gz /path/to/directory-or-file

1. backup drupal database (Mysql)
   mysqldump -uusername -p databasename > backup/folder/file.sql
2. backup drupal database (Mysql)
   mysqldump -uusername -p databasename > backup/folder/file.sql
3. backup drupal database (Mysql)