Copy files with tar:
tar cf – * | ( cd /target; tar xfp -)
Backup and a restore a mySql database:
mysqldump -u username -ppassword database_name > FILE.sql
mysql -u username -ppassword database_name < FILE.sql
Figure out which process is "grabbing" a drive you want to unmount (from Donncha):
# umount /media/disk/
umount: /media/disk: device is busy
# fuser -m /dev/sdc1
/dev/sdc1: 538
# ps auxw|grep 538
donncha 538 0.4 2.7 219212 56792 ? SLl Feb11 11:25 rhythmbox
Sometimes when pasting code in vi, it over-indents. Vim.org has the answer for this:
> All you need to do is “set paste”, then paste your stuff, and then “set nopaste” again.