Question

QUESTION 5

1. 1.    Switch to insert mode, and then create a script that performs the following:

   •       Sets the environment for the script to bash

   •       Have at least two comment lines that state the purpose of the script

   •       Clear the screen

   •       Sends messages back to the screen informing the user of what he or she is seeing displayed on the screen

   •       Have the script perform the following:

   o   Show your home directory

   o   Show your current working directory

   o   Create a directory called demo, and send any errors to a null file so the user does not see them on the screen.

   o   Switch to this new directory

   o   Show you are in the demo directory

   o   Place a empty file named file1 in the demo directory, then

   o   Display a long list of the contents of this (demo) directory

   o   Change back to your home directory

   o   Display a long list of all the files in your home directory

   2.   What construct did you use to send command errors to a null file in your script?

   Answer:__________________________

4 points   

QUESTION 6

1. Save your changes and exit the vim editor.

   Command(s) to save your file and exit the vim editor?

   Answer:___________________________________

   2.   Display the permissions for your script.

   What command did you use?:__________________________

   Answer:________________________

   3.   Does the owner have execute permission?

   Answer:____________________________________________

   4.   Give the user (owner) execute permission to run the script.

   What command did you use to change the permissions on the script?

   Answer:__________________________________________

   What notation did you use to change permissions: symbolic or numeric (octal)?

   Answer:____________________________________________

   5.   Run the script.

   What command did you use to run the script?

   Answer:____________________________________________

Answer 1

Please find the below answers. Please provide your feedback

Thanks and Happy learning!

QUESTION 5

1. Please see the script below in the code section

2. The construct used is : 2>/dev/null, Here the 2 indicates the standard error. So basically we are just redirecting the errors printed to standard error to /dev/null file.

QUESTION 6

1. Command to sane the file and exit the wim console is : wq

Here 'w' means write and 'q' means quit. So to exit from vim editor press 'esc' key then type colon(:) and type 'w' and then type 'q'. Then press enter key to exit the vim console.

2. Use the command ls -l to display the long listing of the file. This long listing included the permission of the file.

3. Yes the owner has the execute permission. The permissions for a file can be read(4), write(2) or execute(1) or the combination of the three. So if a file has the permission 755 then that means the owner has read+write+execute (4+2+1 = 7) permission asn others has only read+execute(4 + 1= 5) permission.

4. command to change the permission is 'chmod'.

So to give the owner the permission to execute us the command 'chmod u+x script.sh' [assuming that the shell script file name is script.sh, here 'u' means the user/owner]

One can use symbolic (ie r,w,x) or numeric (ie 4, 2, 1) notatiosn to add/remove the permissions. In the above command we user the symbolic notation.

5. The script can be run using the command ./script.sh

QUESTION 5

1.

#!/bin/bash
#Above line sets the environment for the script to bash

#Purpose of this script is to practice the
#basic unix/Linux commands

#Clear the screen
clear

#Display message in the screen
echo "Users home directory is : $HOME"

echo "Users current directory is :`pwd`"

echo "Creating directory with name demo."
mkdir demo 2>/dev/null

echo "Switching to the demo directory."
cd demo

echo "Users current directory is :`pwd`"

echo "Creating an empty file named file1 in the demo directory."
touch file1

echo "Long listing of the demo directory is:"
ls -l .

echo "Switching back to home directory"
cd $HOME

echo "Users current directory is :`pwd`"

echo "Long listing of all the files in the home directory is:"
ls -l $HOME