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Part 1
Land of the Lost
Entry 1: January 26, 2012
Began working on all three classes word definitions and some of the projects, such as the install of Ubuntu to a desktop system.
- Learned a bit about aptitude and some uses for it. IE: sudo aptitude, aptitude update, aptitude upgrade.
- Was useful in that we did not set up the correct path for our install from the server, it was using the generic one from the hosted site and we needed to change it.
- Not particularly sure on the difference of what update and upgrade did, just that it was explained as that is normally what a system does when it looks for updates and upgrades to them.
- Accomplishing all of the work between the three classes seems rather time consuming and somewhat repedative between some of the work required for them, such as the submitted files required etc.
- svn add *.* where * is the file and the extension.
- svn commit -m “*.*”
Entry 2: February 4, 2012
root
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home
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jdavis34
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___________________________
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bin src data lab2 lab1
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___________
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cprog unix submit
Entry 3: February 28, 2012
After a long extensive process I caught up on the 1 assignment I missed cause I was deathly ill over the weekend, and CSx04 which for some reason did not submit the first time I did it. Now I believe it is time to get working more on the Opus and try to see if I can find a work around for the Android tablet and certain keys not functioning correctly with remote log in for lab 46. Probably maybe going to work on a experiment as well.
Spent some time playing with and tweak Vi editor so when coding it is more comfortable to use. jdavis34@lab46:~/src/cprog$ vim ~/.vimrc
1 syn on 2 set nu 3 set ruler 4 set title 5 set cul 6 hi CursorLine term=underline cterm=underline gui=underline 7 set insertmode WTB more cool things to do with VI
Entry 4: February 29, 2012
aptitude install cmake
aptitude install build-essential
aptitude install mysql
aptitude install mysql-server
cd /usr/src – to change the current directory to /usr/src directory
wget http://download.berlios.de/pvpgn/pvpgn-1.8.5.tar.gz
wget http://download.berlios.de/pvpgn/pvpgn-support-1.2.tar.gz
tar xfz pvpgn-1.8.5.tar.gz
tar xfz pvpgn-support-1.2.tar.gz
to start /usr/local/sbin/bnetd
To stop: sudo killall bnetd
To restart: sudo killall -HUP bnetd
To force quit: sudo killall -KILL bnetd
Keywords
cprog Keywords
Standard I/O (STDIO, STDOUT, STDERR)
Definition
FILE *stdin
stdin is associated with a user's standard input stream. usually a keyboard.
FILE *stdout
stdin is associated with an output stream used for normal program output. usually a display terminal.
FILE *stderr
stdin is associated with an output stream used for error messages. often a display terminal.
Demonstration
Demonstration of the chosen keyword.
If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:
/* * Sample code block */ #include <stdio.h> int main() { int x; printf( "please type your age: \n"); scanf( "%d", &x ); printf( "Is your age, %d \n"); return(0); }
Header Files
Definition
A header file is a file containing C declarations, You request the use of a header file in your program by including it, with the C preprocessing directive `#include'.
Demonstration
There are a large number of headers listed bellow is a few
/* * Sample code block */ #include <stdio.h> #include <math.h> #include <signal.h> #include <stddef.h> #include <complex.h> int main() { return(0); }
arithmetic (equations, operators)
Definition
Operator Description
+ Adds two operands
- Subtracts second operand from the first
* Multiply both operands
/ Divide numerator by denumerator
% Modulus Operator and remainder of after an integer division
++ Increment operator, increases integer value by one
– Decrement operator, decreases integer value by one
Demonstration
Binary arithmetic operators are +, -, *, /, and %.
int a = 25; int b = 5; int c; c = a + b; printf( "a + b = %dn", c ); c = a - b; printf( "a - b = %dn", c ); printf( "a * b = %dn", a * b ); c = a / b; printf( "a / b = %dn", c ); c = 100 % 3; printf( "a % b = %dn", c );
logic and operators (and, or, not, xor)
Definition
“==” Checks if the value of two operands is equal or not, if yes then condition becomes true.
“!=” Checks if the value of two operands is equal or not, if values are not equal then condition becomes true.
“>” Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true.
“<” Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true.
“>=” Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true.
“⇐” Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true.
“&&” Logical AND operator. If both the operands are non zero then then condition becomes true.
“||” Logical OR Operator. If any of the two operands is non zero then then condition becomes true.
“!” Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.
Demonstration
Demonstration of the chosen keyword.
If you wish to aid your definition with a code sample, you can do so by using a wiki code block, an example follows:
/* * Sample code block */ #include <stdio.h> int main() { return(0); }
Alternatively (or additionally), if you want to demonstrate something on the command-line, you can do so as follows:
lab46:~$ cd src lab46:~/src$ gcc -o hello hello.c lab46:~/src$ ./hello Hello, World! lab46:~/src$
Variables
man3 printf Are allocated blocks of storage in memory that we can associate with a name, such as “pirce”, “age”, “year”, etc.
Name Type Range
int Numeric - Integer -32 768 to 32 767
short Numeric - Integer -32 768 to 32 767
long Numeric - Integer -2 147 483 648 to 2 147 483 647
float Numeric - Real 1.2 X 10-38 to 3.4 X 1038
double Numeric - Real 2.2 X 10-308 to 1.8 X 10308
char Character All ASCII characters
Examples of variables can be but not limited to:
int x %d short x %d long x %d char x %c float x %f double x %lf
Sizeof
The sizeof operator gets the size of its operand.
This initializes X to the size of c, resulting in a integer of the type size_t:
size_t X = sizeof(c);
String
In computing, a C string is a character sequence terminated with a null character
In the following, the string literal “hello world” is printed.
/* * Sample code block */ #include <stdio.h> int main() { printf("hello world"); }
Repetition/Iteration Structures For
The variable initialization allows you to either declare a variable and give it a value or give a value to an already existing variable. Second, the condition tells the program that while the conditional expression is true the loop should continue to repeat itself.
FOR - for loops are the most useful type. The syntax for a for loop is
for ( variable initialization; condition; variable update ) { Code to execute while the condition is true }
cprog Objective (added)
demonstrate structured and object-oriented problem solving concepts
By the end of this semester show the ability to demonstrate the use of logic and structure in program writing.
Method
The method of this could be variously described, but a easy effective means would be to ask a student to create a set of instructions that:
1. creates a program
2. Initializes the program
3. contains a logical sense to obtain a desired result, IE: if someone wanted to multiply 2 numbers and get a result.
Measurement
To asses how a students effectiveness was in creating this first:
1. Does the program compile without errors.
2. Does the program ask for input for the 2 variables to be multiplied.
3. Does the program give the correct desired answer for this function it is to serve.
4. Lastly the code in which it is written, was it initialized properly, does it only prompt the user for one occurring event, Does it ask the user to input a variable to end, does it continuously loop and not close itself without the user having to exit the program, there is a large list in structuring the means to a achieved goal and many ways to reach it, but in the end was it the most efficient.
Analysis
Reflect upon your results of the measurement to ascertain your achievement of the particular course objective.
- How did you do? So far have created a few usable logical programs, simple but usable.
- Room for improvement? ALOT
- Could the measurement process be enhanced to be more effective?
- Do you think this enhancement would be efficient to employ?
- Could the course objective be altered to be more applicable? How would you alter it?
hpc0 Keywords
Aptitude
Identification of chosen keyword (unless you update the section heading above).
Definition
Aptitude is a menu-driven, text-based front-end to the Advanced Packaging Tool or APT system. Many of the common package management functions, such as installation, removal, and upgrade, are performed in Aptitude with single-key commands.
Demonstration
start Aptitude as a normal user with the following command at a terminal prompt
lab46:~$ sudo aptitude
lab46:~$ aptitude update
lab46:~$ aptitude upgrade
para-virtualization
Definition
Is a virtualization that presents a software interface to virtual machines.
full-virtualization
Definition
virtualization technique that provides a virtual machine enviorment that is a complete simulation of the underlying hardware. It requires that every aspect of the hardware be reflected on other virtual machines, including the full instruction set, input/output operations, interrupts, memory access, and whatever other tools that are used by the software that runs on the bare machine.
Xen
Definition
A virtual machine monitor that allows multiple multiple operating systems to execute on the same hardware.
PvPGn
Definition
This is a server emulation software, that emulates blizzard battle.net online gaming services.
Demonstration
In the process of setting up a server so more will come for this part of this one..
Virtual Server
Definition
Virtual Server, is a server to which intended virtual machines will be hosted and or migrated off of.
Demonstration
this example is the server that had been created in class.
lab46:~$ ssh root@vmserver02.student.lab
Virtual Machine
Definition
A machine on a server set up to run particular processes predefined by the user but not limited to just these, or not limited to only existing inside of a virtual machine. The benefit to this is the ease of portability depending on software used in porting it to other systems without reconfiguration, and possibly while it is still running.
Demonstration
Again this example is the virtual machine within the server created in the previous word.
lab46:~$ ssh root@vm34.student.lab
Configuration
Definition
Defining a script that is set to run on the start up of a software or service that determines particular variables that effect the working environment in relation to end user settings desired in a particular circumstance.
Demonstration
such files as working with the pvpgn server we are setting up are:
*.conf
hpc0 Objective(needed)
hpc0 Objective
State the course objective
Definition
In your own words, define what that objective entails.
Method
State the method you will use for measuring successful academic/intellectual achievement of this objective.
Measurement
Follow your method and obtain a measurement. Document the results here.
Analysis
Reflect upon your results of the measurement to ascertain your achievement of the particular course objective.
- How did you do?
- Is there room for improvement?
- Could the measurement process be enhanced to be more effective?
- Do you think this enhancement would be efficient to employ?
- Could the course objective be altered to be more applicable? How would you alter it?
unix Keywords
Local host
Definition
“Localhost” refers to the local computer that a program is running on
Demonstration
Remote host
Definition
Remote Host is the host in which you remote into, IE not the actual machine you are on but the remote one where the application or operating system exists.
Demonstration
Home directory
Definition
The home directory is, the directory where the users home resides, essentially the root directory to the user but not really the root.
Demonstration
Current working directory
Definition
Is the directory that you are currently working in, and or where you are in relation to the root.
Demonstration
Regular file
Definition
They show up in ls -l without a specific character in the mode field. Called regular files, to distinguish them from special file types.
Demonstration
lab46:~/src/unix$ ls -l total 4 -rw-r--r-- 1 jdavis34 lab46 1 Jan 26 12:14 something
Directory
Definition
Most common special file. In a directory listing ls -l, they will show up with a d in the beginning.
Demonstration
lab46:~$ ls -l total 8 -rw------- 1 jdavis34 lab46 1100 Oct 15 14:03 #pico29112# lrwxrwxrwx 1 jdavis34 lab46 18 Feb 10 2011 Maildir -> /var/mail/jdavis34 drwxr-xr-x 2 jdavis34 lab46 6 Sep 4 21:21 bin lrwxrwxrwx 1 jdavis34 lab46 28 Aug 30 17:02 data -> /usr/local/etc/data/jdavis34 drwx---r-x 4 jdavis34 lab46 4096 Apr 27 2011 public_html drwxr-xr-x 6 jdavis34 lab46 68 Jan 26 11:07 src drwxr-xr-x 4 jdavis34 lab46 28 Jan 26 09:44 src.bak
GUI
Graphical User Interface- programs used by devices in order to provide human interface with the computer. I (I.E. keyboard,screen,mouse,trackball
tar/gzip
Definition
TAR
Tar is a very commonly used archiving format on Linux systems. The advantage with tar is that it consumes very little time and CPU to compress files, but the compression isn’t very much either. Tar is probably the Linux/UNIX version of zip – quick and dirty.
TAR.GZ
This format is my weapon of choice for most compression. It gives very good compression while not utilizing too much of the CPU while it is compressing the data.
Demonstration
- TAR
- compress a directory:
# tar -cvf archive_name.tar directory_to_compress
- extract the archive:
# tar -xvf archive_name.tar.gz
- Gzip
- compress a directory:
# gzip [ -acdfhlLnNrtvV19 ] [-S suffix] [ name ... ]
- extract the archive:
# gunzip [ -acfhlLnNrtvV ] [-S suffix] [ name ... ]
unix Objective
structure of UNIX systems
familiarity with the structure of UNIX systems
Definition
The ability to show that one understands and can demonstrate successfully navigating within a Unix based system via command line.
Method
To do this have several lists of directories to create, including sub directories and files to be placed within these directories, all off the users home directory.
Measurement
make a few directories off of your user, some inside of others etc etc until you have around like 15 random directories and put some files in some. Once this is done move to a particular directory and from here navigate to other directories without using a absolute path, have some text file displaying without absolute path etc etc.
Analysis
Reflect upon your results of the measurement to ascertain your achievement of the particular course objective.
- How did you do? Pretty easy for the most part so long as people have familiarity with command line and navigation etc
- Is there room for improvement? Always room for improvement such as using quotes, wild-cards, tabbing shortcuts etc.
- Could the measurement process be enhanced to be more effective? If there was a specific set of files, with particular routes to be taken and specific characters used within names that might cause complexity.
- Do you think this enhancement would be efficient to employ? Yea I also think its apart of the first few lessons and continues throughout the course so far, so as long as someone keeps up on their work they should be good.
Experiments
Experiment "IF or not IF"
Question
What is the use of \n and to what effect does it have if in a simple program designed to print “hello world” if:
1. it exists.
2. it does not.
Resources
created a simple program that says “hello world”
1.
#include <stdio.h> void main() { if(printf("Hello World\n")) }
2.
#include <stdio.h> void main() { if(printf("Hello World")) }
Hypothesis
Based on what I know the function of /n is, to tell the program next line, I think it either will not compile, or it will not display “hello world” on its own line creating a new line after execution. State your rationale.
Experiment
As listed in resources I created 2 programs to test one with one without, and plan to run both and record the results.
Data
1.
lab46:~$ cd src lab46:~/src$ gcc -o hello hello.c lab46:~/src$ ./hello Hello, World! lab46:~/src$
2.
lab46:~$ cd src lab46:~/src$ gcc -o hello hello.c lab46:~/src$ ./hello Hello, World!lab46:~/src$
Analysis
Based on the data collected:
- was your hypothesis correct? Yes and no, I was not sure if it would compile and it did, but as I suspected if it did, it would print the text without breaking to a new line.
- was your hypothesis not applicable? yes
- is there more going on than you originally thought? Not really due to this test was kinda simple, in understanding context of code and its importance to output.
Conclusions
Based on the data collected, It is obvious the use, and results of having /n in program syntax, where as if it does not exist what will happen.
WSUS Server No Active directory
Question
Is It possible to have a domain-less, no active directory server OS that is capable of updating windows client machines, via client redirected to server.
Resources
Collect information and resources (such as URLs of web resources), and comment on knowledge obtained that you think will provide useful background information to aid in performing the experiment.
Hypothesis
Based on everything I have read and come accross this is a viable method of deployment and for particular scenarios more recommended. Though a little more complicated in deploying, the ease of use without a central server to have to log into is more applicable to smaller client based enviorments.
State your rationale.
Experiment
Based on my findings, I plan to do the required aspects of fulfilling desired outcome.
-Edit/create registry entries corresponding with directing windows to the server for updates rather than Microsoft. -Create a valid certificate, allowing for the client to validate itself to the servers SSL.
Data
Currently I am stuck at getting the actual client machine to stop looking for its updates via Microsoft. I have disabled, re-enabled, wuauclt.exe /detectnow. All over required aspects, apparently I missed something so further testing on this is required, but hopefully the desired outcome is true.
Analysis
Based on the data collected:
- was your hypothesis correct? pending (UPDATE) So far it is working but the server/client relationship is denied, as I expected, I may need to create some sort of certificate for self certifying access.
- was your hypothesis not applicable?
- is there more going on than you originally thought? Yes and No, its hard to say, yes because its not working currently, and no because its probably a matter of something being over looked.
- what shortcomings might there be in your experiment? Its not giving a desired result reguardless of information that says it will.
- what shortcomings might there be in your data? Some data might lack content of something crucial.
- NOTE One of the registry entries had spaces in the name which was causing it to return with a null entry upon installing.
Conclusions
Conclusion so far is that this is a valid means of creating a windows update server outside of using active directory, but there is still more work needed.
For a continue up I have successfully got my WSUS server to work. It not only works in the domain environment, but i was able to successfully get clients non-existing in the domain to be redirected to the server for updating. The registry I had made was all correct except for one variable had spaces in the name, which was causing a <NULL> problem. Once that was done all I had to do was figure out what was causing the actual verification errors. I can write and explain it so easily its somewhat embarrassing how much time it took to finish, all I had to do was create a self signing certificate on the server to deploy to end users.
Experiment 3
Question
What happens when a “int” is multiplied by a “float” and the output is “float”.
Resources
With what I have gathered and from some of the small projects I have yet to submit I have gathered enough to be able to write and perform this on my own.
Hypothesis
Based on what I have seen when playing with the two var types I either expect it to return the answer that it should be, or the answer will be effected by the fact the two vars are of not the same type.
State your rationale. 1.5 x 2 = 3 1 x 3 = 3 this case 1.5 = float 2 = int and 3 = float or int, so it should work in that it has the ability to output a decimal number still.
Experiment
Going to set up a scenario as follows:
#include <stdio.h> float mult ( int x, int y ); main() {
float x; int y; printf( "Please input two numbers to be multiplied: " ); scanf( "%f", &x ); scanf( "%d", &y ); printf( "The product of your two numbers is %f\n", mult( x, y ) ); getchar();
} float mult (float x, int y) {
return x * y;
}
I keep having trouble when placing the code statements before and after this small section, and I can't quite see what is doing it, but experiment one is tied into this one when I do it. I don't think I have a unclosed code tag above?
Data
Well nothing of what I had expected happened.
Analysis
Based on the data collected: I had got an error of conflicting types for 'mult', and previous declaration of 'mult' was here.
- was your hypothesis correct? No, I guess I have to get to understand variables more than I had thought.
- was your hypothesis not applicable? It would not even compile.
- is there more going on than you originally thought? Yes and no, I thought since it made logical sense 1.5×2 is 3 that it would be able to execute.
Conclusions
Learning new languages can be annoying when trying to overcome the way we have already been wired to learn.
