Delete the folds

1. rm 
   which is for delete a file
2. rm -rf
   which is for delete a fold 

Permission

1.sudo su
2.chmod 777
3.ls -l

Mnt

1. mkdir
2. mount -t ntfs-3g /dev/sda1 /mnt/ftp
   just for ntfs.
3. cat /proc/mounts
4. df -h

Get informations

1. uname -r -m 

Shutdown

1. shutdown -h now 
2. init 0
3. telinit 0

rpm and unrar

1. tar -xvfz
2. unzip