Technology

  1. Display the command(s) used to do the following: create a script that uses case logic to have someone guess your favorite sandwich, such as tuna. Show results.

 

  1. Display the command(s) used to do the following: display the cclontents of .bashrc file. Next, use the vi editor to edit that file and put in an alias so that you see a long file listing of a directory every time you type list. Show results.

 

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  1. Display the command(s) used to do the following: use a command to simulate how you would troubleshoot a problem with the sandwich script you created in the question above. Show results.

 

  1. What is wrong with the following lines of code?

While [ “$value” = “100” ; do

    Echo “That’s a large number.”   read value

Fi

 

            There does not need to be a [

            While and echo are capitalized

            It only works on the number 100

 

  1. Display the command(s) used to do the following: write a script that creates the following menu using a while loop and tput command:

 

Soup Menu

==========

(t)omato

(b)ean

(s)quash

Select a soup … (q) to quit

 

Show results.

 

  1. What are the exit statuses of the test command discussed in this chapter and what do they mean? How can you view the exit status results of the test command directly from the command line? Show results.

 

  1. Display the command(s) used to do the following: create a variable called mem_size and set its contents to 1024. Next, use the test command to determine if the contents of mem_size is less than or equal to 512. Show results.

 

  1. Display the command(s) used to do the following: set your shell from the command line to be the bash shell. Then, use the echo command to verify the contents of the shell variable. What is now contained in the shell variable?

 

Use the test command to evaluate whether the shell variable contains a reference to the bash shell and use the echocommand to determine the result. (Note that this provides one way to verify from within a script that the script user is set up to use the bash shell.).

 

Show results.

 

  1. Display the command(s) used to do the following: make your home directory your current working directory. Use the vi or Emacs editor to create the veg_choice script below. Enter a line in that script to ensure the script uses the bash shell. Run veg_choice to ensure your change works properly. Show results.

 

echo -n “What is your favorite vegetable?”

read veg_name

if test $veg_name = “broccoli”

then

echo “Broccoli is a healthy choice.”

else

if [ “$veg_name” = “carrots” ]

then

echo “Carrots are great for you.”

else

echo “Don’t forget to eat your broccoli also.”

fi

fi

 

Edit the veg_choice script again but, this time, change the line: if [ “$veg_name” = “carrots” ] to use the test command. Show results.

 

  1. Display the command(s) used to do the following: create a shell variable that outputs the calendar for the current month (call it CALNOW).

 

How could you set up CALNOW so that it works every time you log in using the bash shell?

 

Show results.

 

  1. Display the command(s) used to do the following: in your source directory, write a script called “them” in which you create a function called whoisthere that displays a listing of who is logged in and displays the column headings for the information displayed.

 

Make the contents of your “them” script resident in memory and test your whoisthere function.

 

Modify your whoisthere function so that you can enter “These are the folks logged in:” as an argument to appear before you list who is logged into the system.

 

What actions do you take next to use the whoisthere function with your modifications?

 

How can you set up your new whoisthere function so that it can be run each time you log in using the bash script?

 

Show results.

 

  1. Troubleshoot the problems with the following script (there are 6 errors/corrections. Describe them below):

 

#===============================================

Script Name: record_entry

By:          TRJackson

#===============================================

looptrack=y

while [ “$looptrack” = 1 ]

do

echo -n “Type in the account number:” read account

echo -n “Type the first and last name:” ; read full_name

echo -n “Type the age:” red age

echo -n  “Enter another record?” ; read looptrack

finish

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