Question

For this part of the assignment I want you to execute the script CS50_hw_session04b. This will create a directory called hw_session04 in your home directory. Change directories to hw_session04.

- Execute file_1 in hw_session04

- Read file_2 in hw_session04

- Create the file dir_3/name with the output of the whoami command and the first secret code when you execute file_1. Save the output of executing file_1 exactly as shown. There should be two lines in dir_3/name.

- Create the file dir_3/now with the output of the date command and the second secret code when you read file_2. Save the output of reading file_2 exactly as shown. There should be two lines in dir_3/now.

- Create a file called jamesbond in hw_session04 with the output of the date command. Change the permissions of the file jamesbond so that user has no access, group has no access but other has full access.

- Create a file called myfriend in hw_session04 with the output of the date command. Change the permissions of the file myfriend so that user has full access, group has read and execute access and other has no access.

- Execute the following commands and add the output to a file call session04b_hw

--- Echo your first and last name as the first line of the file session04b_hw

--- Get a long listing of the files in hw_session04

--- Display the contents of the file dir_3/name

--- Display the contents of the file dir_3/now

--- Echo the following message "The permissions of jamesbond is XXX". When you echo this message replace the XXX with the numeric permission value for the file jamesbond before echoing out the message.

Once you have executed the above commands, look over the file session04b_hw and check that it looks like you would expect based on the commands you have executed.

Answer 1

*. To execute the script CS50_hw_session04b . give it executable permission by typing
            chmod +x CS50_hw_session04b
    then you can execute it by typing
            ./CS50_hw_session04b

    or you can execute the sript
            sh CS50_hw_session04b

                                       or

            bash CS50_hw_session04b

Now change directory into CS50_hw_session04 which is in the home directory

           cd ~/CS50_hw_session04

type command  

          ls

to see the files in the directory. you can see file_1 and file_2

- to execute file_1 type
          bash file_1

- to read the file_2 you can use commands 'cat' or 'less'

        cat file_2

           or

        less file_2

- to create dir_3 ,type

      mkdir dir_3
  
      for the rest of the task type

       whoami >dir_3/name
       bash file_1 >>dir_3/name
- type command
      date > dir_3/now

      cat file_2 >>dir_3/now

- type commands
      date > jamesbond
      chmod 007 jamesbond
- type commands
      date > myfriend
      chmod 750

- type theses commands
     --
          echo "first name" >session_04b_hw
     --
          ls -l

     --
          cat dir_3/name
     --
          cat dir_3/now
     --
         echo "The permission of jamesbond is $(stat -c "%a" jamesbond) " >> session_04b_hw