Ex. 1. Just as before, you will need to copy the content of the terminal to a file called hw2.txt.

• Find out what part of your quota you have already used. Print the list of directories in your home directory with the total size of the files inside them. Print the structure of the filesystems on your computer. For this part, use the commands quota, df, and du, that were shown in the demo.
• Use the command which to find the absolute path for the command grep that we have used in the previous homework.
• Display the current date and time (find this command in Chapter 3 in the textbook or you can try to guess it).
• Use the command ps to display all the processes running on your computer with a long list of details for each of them. Display the same list using the command top. I suggest to use the subject index in your textbook if you want to learn more about these commands.
• Launch the application pico from the terminal in the background. For this, run the command terminated with an & character:
  pico &
• Find out what the process id is for this process. Do not list all the processes active on your computer again, but only those running from the terminal. Kill the process named pico and the list the processes runing from the terminal again to make sure it's not there anymore.
• Launch the pico application again in the background and bring it to the foreground. The command to bring the application to the foreground is fg. Exit the editor without writing any file.
• From the list of processes running on your computer, choose one and write down the process id. Find out if this process uses any temporary files while running. For this, you need to check the content of a folder with a name equal to the process id in /proc.

Ex. 2 Archiving files

List all the files starting with an m from the directory /bin. Suppose that we want to create an archive of these files. Without changing your current directory (if you changed it before, go back to your home directory), create the archive with the following command:
tar cf binm.tar /bin/m*

List the files in the current directory to see if the archive was created correctly. List the files contained in the archive with the following command:
tar tf binm.tar

List all the files in the current directory with a long list of attributes.

Compress the tar file created at the previous step with the command gzip:
gzip binm.tar

List the files again with the option -l to compare the size of the archive before and after the compression with gzip.

Ex. 3.

• Use the ~ character to copy the file icing.jpg that you can find in the relative path temp/c151/ from my home directory. My username is danav. You can find out about the use of this character on page (89). Place this file inside your c151 folder.
• View the content of the file with the command
  display icing.jpg
  You'll need to be in an X11 environment for that (see Lab 3 for explanations about X11 clients).
• Change the permissions to the file icing.jpg such that anybody can read it. You can review this command by reading pages 92-94 from the textbook and it is shown in the demos.
• Change the permission to the c151 folder to be accessible for executing to anybody. Do the same with your home directory (but do not give everybody read or write permissions to either of these folders).

  Create a symbolic link to the file icing.jpg that can be found in my home directory under temp/c151 and call it ice.jpg. List the content of the folder to show that the link was created properly. Display the file itself using this link.