UBUNTU

Basic Utilities and commands.

Open your terminal and connect to snowball server. Change your directory to your home directory (cd ~ ), and then create a new directory named as PC2 (mkdir PC2). After that, go to directory PC2 (cd PC2) and please download a test file by the following command (internet access required):

cp /home/local/GSUAD/ylong4/PC2/CSC_Course.txt CSC_Course.txt

Be sure it succeeds using ls to see the file name CSC_Course.txt listed.

Then please write the commands you will issue to complete the following tasks step by step. And for question 10), please only provide some descriptions as an answer.

Note: You cannot use cd to change the working directory during the steps. Each task requires only one command.

ANSWER ALL QUESTIONS ON PAPER !!!

1) Use cat to display the content in "CSC_Course.txt".

2) Count only the lines in "CSC_Course.txt".

3) A. Open the manual page for command cat .

B. Go to next screen. Note: please read the descriptions for option s and n

C. Quit the manual page.

D. Display "CSC_Course.txt" again with line numbers.

E. Display "CSC_Course.txt" again while suppress repeated empty out lines.

F. Display "CSC_Course.txt" again with line numbers and suppress repeated empty out lines.

4) Output the first 15 lines of "CSC_Course.txt".

5) Output the last 15 lines of "CSC_Course.txt".

6) Display the absolute pathname for current working directory.

7) Use absolute pathname to rename "CSC_Course.txt" as "CSC_Course.bak" .

8) A. Create a new folder "Backup".

B. Copy CSC_Course.bak into this folder and give it a new name CSC_Course.bak1 using relative pathname.

C. Check the existence of CSC_Course.bak1 in folder "Backup" by using ls and relative pathname.

9) Display the long listing information for file " CSC_Course.bak" only.

10) What is the meaning for each bit in the file permission mode for file " CSC_Course.bak "? (Please provide some descriptions)

11)For file CSC_Course.bak, use chmod to add read and write permission for all without using octal number.

12) For file CSC_Course.bak, use chmod and octal number to set user only read permission, set group no permissions, and set other no permissions.