1. cd    etc

    cd   /ect

2. ls -l    all information (name,permission,ownship)

   ls -m     only name

3. sudo find -iname (ignore HighLow capital and small letter)

sudo find -iname *php.ini*

4.

  sudo mkdir  folder   

  sudo mkdir  folder   /etc/network/folder

(make directory)

  5. sudo rm file

   sudo rm folder -R (file exit this folder)

6.

   sudo mv file1 file2  (rename)

  sudo mv /file1  /etc/file1

7.

   sudo cp file  file.bak

8. Mounting Drives

sudo mkdir /mnt/drive

sudo fdisk  -l     (show disk information)

sudo mount /dev/sda5   /mnt/drive

cd   /mnt/drive

ls -l

sudo umount /dev/sda5

mount CD

sudo mount /dev/cdrom   /mnt/cdrom