log onto the host sp-cfsics.metrostate.edu, then try the content discussed below. Please create a directory lab3 (see lab2 page 3 for how to) and do the following exercises.

 

• The “pico” screen editor was originally designed for the users to edit messages within an email program called “pine”. With the respect to “pine”, “pico” stands for “pine composer”.
• “pico” also means “small”. For instance, one trillion picoseconds make one second.
• “pico” has a limited number of commands and rules.
• “pico” can be used separately from “pine”. In other words, “pico” can be used by itself.
• “pico” was adapted from a version of “emacs” called “micro emacs”.
• “emacs” is a screen editor itself but it is more complicated and bigger than “pico”.
• Examples:

Format 1: invoke pico with a file name

$ cd

$ mkdir lab3

$ cd lab3

$ pico test2

this is a test.

^x

y

$

Note: ^x means CTRL-x, and y and  are responses to the screen prompts, not part of the file.

$ cat test2

this is a test.

$

Format 2: invoke pico without a file name

$ pico

this is a second test.

^x

test3 

$

Note: ^x means CTRL-x, and test3 and s are responses to the screen prompts, not part of the file.

$ cat test3

this is a second test.

$

• The basic commands of pico are provided in the following table.

Command	Function
	Delete a single character backward
	The same as key
^K	Delete the current line or marked text
^R	Read in a file
^T	Spell checker
^U	Undelete last text deleted by ^K
^X	Save a file to the disk

 

• Using pico to edit your homepage file "index.html". Your homepage folder is ~/public_html

$ cd ~/public_html

$ pico index.html

Since the file “index.html” exists, you are going to see the following information on your screen:

Welcome to Metropolitan State University

Please update the file according to the following information (html documents are not case-sensitive):

CFS 264 Computer and Operating Systems Fundamentals II

Metropolitan State University

  This web site is still under the construction. Please send your comments to

 put your name here

.

Here are my five favorite links for learning Operating Systems:

Operating Systems: Three Easy Pieces by Remzi H. Arpaci-Dusseau and Andrea C. Arpaci-Dusseau

To check on your homepage, follow the instructions below:

• Invoke either MS Internet Explorer or any other web browser
• Check on the following URL:

http://sp-cfsics.metrostate.edu/~cfs264su20xx

• If the web page does not work properly, please modify it accordingly. Otherwise, please print out the page and hand it in before you leave.

 

•  

 

• Learn how to run a Java, C or C++ program on Linux
• At the prompt “$”, please do the following:

$ cd ~/lab3

 

Java:

• Please create the following file using pico with a file name as "Greeting.java".

public class Greeting

{

       public static void main(String[] args)

       {

              System.out.println("Hello, CFS 264 Class!");

       }

}

• After you create the file above, at the prompt “$”, please follow the steps below:

$ javac Greeting.java

$ java Greeting

Hello, CFS 264 Class!

$

Notes:

• If you see some syntax errors, you should use “pico” to correct them accordingly and then rerun the programs as shown above
• A concise pico tutorial can be found at: https://www.ssc.wisc.edu/sscc/pubs/7-15.pdf  

 

C

• Please create the following file with a file name as "myfirst.c".

#include

 

int main ()

{

        printf("Hello, Metropolitan State University!");

}

• After you create the file above, at the prompt “$”, please do the following:

$ gcc myfirst.c

$ ./a.out

Hello, Metropolitan State University!

$

$ gcc -o myfirst myfirst.c

$ ./myfirst

Hello, Metropolitan State University!

$

 

C++

• Please create the following file with a file name as "firstcpp.cc".

#include

 

int main()

{

        std::cout << "Hello, Metro State Students!" << std::endl;

        return 0;

}

• After you create the file above, at the prompt “$”, please do the following:

$ g++ firstcpp.cc

• If there is warning message regarding deprecated header, just ignore it and continue to the next step:

$ ./a.out

Hello, Metro State Students!

$

$ g++ -o firstcpp firstcpp.cc

• If there is warning message regarding deprecated header, just ignore it and continue to the next step:

$ ./firstcpp

Hello, Metro State Students!

 

 

Note: Please complete Lab 3 before answering the following questions:

 

1. Please provide a single “find” command that displays all the files, excluding directories, that have been changed in the last 7 days under your home directory:
2. Please provide a single “grep” command that counts how many lines in file /etc/hosts that contains “199”:
3. Please provide a single “uniq” command that compares the first 3 characters of lines in file /etc/hosts and then displays the number of occurrences of lines in the file:
4. Please provide a single “grep” command that displays all the lines in all the files, under your home directory, that contain a word “Metropolitan”:
5. Please provide a single “find” command that searches your home directory and all its subdirectories for the files with an extension “.class” and delete them with confirmations:

 

After you complete, please copy and paste everything (you commands, the outputs, the content of files, and etc.) into one file. If a screen shot is necessary, please include it in this file too.