1. Use “fdisk /dev/path-to-your-device” to create new partition
2. “mkfs.ext4 /dev/cciss/c0d1p1″ to create new file system
3. “blkid” to find hard disk UUID
4. Edit “/etc/fstab” to permanently add your new partition
5. Restart server

Check certain process:
ps aux | grep <keyword>

Check what files are being used by a process:
lsof -p

Kill a process
kill -9 <pid>

Prevent a package to be installed, upgraded, or removed:
aptitude install <package>=

Reconfigure broken package configuration:
It’s a handy tool if you have libapache2-mod-suphp and libapache2-mod-php installed, but you want to remove one of them, because sometimes Apache doesn’t know what you prefer; PHP or SuPHP.
dpkg-reconfigure <package>

Download a package without install:
apt-get -d install <packageName>

Assume we have /dev/sda:
1. fdisk /dev/sda
2. Create a new partition: type ‘n’
3. Choose logical or primary partition: type ‘l’ or ‘p’
4. Set the size you want,
5. Write the changes you have made: type ‘w’
6. Exit from fdisk, then make a new file system, for example: mkfs -t ext4 /dev/sda3