Hello, This HW must be done in virtualbox Ubantu taking screen shots of each step progress. Instructions Create a script, called args.sh. As a sanity check, add the line: echo "hello, world", and run...

Hello,

This HW must be done in virtualbox Ubantu taking screen shots of each step progress.

Instructions

• Create a script, called args.sh. As a sanity check, add the line: echo "hello, world", and run the script.


• Print out $0.

• What does this contain?

• Print out $1.

• What happens when you run the script
  with
  arguments?


• What happens when you run the script
  without
  arguments?

• Write a script that accepts
  three
  arguments from the user, then prints out the following:

• The name of the script


• The value of each argument

Part 2

Instructions

• Create a new directory, called /usr/scripts, and move into it.


• Create a script called mkdircd. Add the shebang line #!/bin/bash

• 
  Note: Remember that the shebang line must be the
  first
  line in the file.

• Begin writing your script. It should:

• Create a directory using the first positional parameter


• Move into that directory


• Create a file using the second positional parameter


• Open this file with nano

• Give your script execution permissions.

• 
  Hint: chmod

• Run ./mkdircd ExampleDirectory FirstFile to test.

Part 3

Instructions

• Create a variable, called PREFIX, and set it equal to the script's first argument.

• 
  Note: Expect users to pass an argument like 192.168.1—not
  a full IP address.

• Print the message: Scanning $PREFIX.0/24...


• Use seq to write a loop that prints every number between 1 and 5.


• Update your loop to use PREFIX and the number from seq to print out IP addresses. For example, if PREFIX="192.168.1", your loop should print 192.168.1.1; 192.168.1.2; etc.

• 
  Hint: You can use multiple variables in a string, as in echo "$FIRST_VARIABLE $SECOND_VARIABLE.

• Inside your loop, create a variable called TARGET. Set it equal to the IP address you created above.

• 
  Hint: Replace echo with TARGET=.

• Finally, update your loop to ping the TARGET
  once. Use the -c flag. When it works as expected, update your seq statement to generate numbers up to 255.

Challenges

• 
  Challenge 3a: Redirect the output of ping to /dev/null. Then:

• If the ping is successful, print: $TARGET is UP


• If the ping is
  not
  successful, print: $TARGET is DOWN


• 
  Hint: You can "chain" operators, like: cat nonexistent_file && echo "File exists!" || echo "File does not exist :("

• 
  Challenge 3b
  

• Redirect the $TARGET is UP message to a file called live_hosts. Be sure to
  append
  to the file with >> instead of using > (why?).


• Redirect the $TARGET is DOWN message to a file called down_hosts.


• Print the contents of each file after the loop completes.