IT 244: Introduction to Linux/Unix
Homework 10

Due Sunday, April 15th 11:59 PM

Deliverables

1. A shell script named hw10.sh that performs the operations listed below.
   This file should be in an hw10 directory inside your hw directory inside your it244 directory.
   100 points

Requirements

• Create an hw10 directory in your hw directory inside your it244 directory
• Go to the hw10 directory and run Unix commands that will execute the steps below
• When you have a command line that does what the step asks you to do, paste it into hw10.sh using nano or any other text editor
• When you have completed all the steps, create an echo statement before the commands for each step, that will print the step number to the terminal

Testing

• The script hw10.sh must have the format specified in this document
• Scripts that do not follow the rules specified in the document mentioned above will will have points deducted from their score
• Be sure to test your script and correct any errors you find
• You will lose 5 points for each error that occurs when running your script
• To run your script and see only the error messages run the following command

  ./hw10.sh  >  /dev/null

Steps for Script

1. On a single line, create the following variables with the values given.
   • Variable a with the value 5
   • Variable b with the value 3
   On another single command line, create the following variables with the values given.
   • Variable s1 with the value "foo"
   • Variable s2 with the value "foo"
   • Variable s3 with the value "bar"
   Print all variables and their values to the terminal.
2. Write a test expression that returns a value indicating true or false when testing whether a is equal to b. Echo the results of this test to the terminal.
3. Write a test expression that returns a value indicating true or false when testing whether a is less than b. Echo the results of this test to the terminal.
4. Write a test expression that returns a value indicating true or false when testing whether a plus b is greater than 9. Echo the results of this test to the terminal.
5. Write a test expression that returns a value indicating true or false when testing whether s1 is equal to s2. Echo the results of this test to the terminal.
6. Write a test expression that returns a value indicating true or false when testing whether s1 is not equal to s3. Echo the results of this test to the terminal.
7. Write a test expression that returns a value indicating true or false when testing whether s1 has a length greater than 0. Echo the results of this test to the terminal.
8. Do the following
   • Copy the directory dir1 from ~tsoro/course_files/it244_files
   • Copy the file empty.txt from ~tsoro/course_files/it244_files
   • Run a single command to show the permissions on the contents of your hw10 directory
9. Write a test expression that returns a value indicating true or false when testing whether dir1 is a directory. Echo the results of this test to the terminal.
10. Write one test expression that returns a value indicating true or false when testing whether empty.txt is readable and is writeable. Echo the results of this test to the terminal.