Table of Contents
Part 3
Entries
Entry 1: November 14, 2012
Today was a work on stuff day. People were all working on the Super Puzzlebox 2 Turbo. I had it done so I worked on my Unix and Discrete keywords 3. I finished them pretty quick and just kept looking up different arguments for them to add in my definitions. Before class really started we were talking about ASCII art and 4chan.com. I wanted to go to it but we decided it probably wasn't the best idea to do it here. I also have to remember to watch the TED video of the guy who made or owns 4chan, moot I think.
Entry 2: November 28, 2012
Today we went over all the stuff we have to do for the EoC projects. After we got done going over everything we started a work on stuff day
Entry 3: November 29, 2012
Today we made the CCC logo with the gd library. Im really glad we did it because I wasn't real very confident with the gd library. After we got the first C in CCC the the other two C's went pretty easy. The only trouble I really had after the first C was trying to get them to touch just a little and make it actually look like the CCC logo.
Entry 4: November 30, 2012
Today was a work on stuff day. I started working more on my opus because for some reason I waited until the last day again. I did the combination and the cron/crontab/at demonstration. Hopefully I will get the experiment done before I leave today too.
Keywords
discrete Keyword 3
regular expression
Definition
Regular expressions are commands that match a pattern or characters in a string of characters or words. Some of the regular expression commands are the ^ that matches the beginning of a line, the $ matches the end of line, the \< matches the beginning of the line, \> matches the end of the word, . matches any single character, * 0 is 0 or more of the previous character or whatever you put in front of the *, [] matches any of the characters enclosed, [^ ] does not match any of the characters enclosed. Then there is also extended regular characters or egrep. Those are () which is like \( \), | which means or and + which matches 1 or more of the previous character. Usually you have to use a combinations of these to get what you want.
References
- notes from unix/linux class
discrete Keyword 3 Phase 2
combination
Definition
A combination is a set containing a certain number of objects that have been selected from another set. In combinations, the order of the elements does not matter.
References
List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).
- wikipedia
- class
Demonstration
Demonstration of the indicated keyword.
Example:
If you have three people Ted, Sue and John there 6 different ways or combinations you can order them. Ted, Sue, John; Ted, John, Sue; Sue, John, Ted; Sue, Ted, john; John, Sue, Ted; John, Ted, Sue;
unix Keyword 3
sort/uniq
Definition
The sort commands sorts the the lines of text files in order. You can use different arguments like -r to sort them in reverse order. The uniq command is used with the sort command to remove duplicate lines in the file that you are sorting. There are also arguments for uniq like -d that only prints duplicated lines or -u that only prints unique lines.
References
List any sites, books, or sources utilized when researching information on this topic. (Remove any filler text).
- man page for sort
- man page for uniq
unix Keyword 3 Phase 2
cron/crontab/at
Definition
Is the time-based job scheduler in Unix-like computer operating systems.
Enables users to schedule jobs (commands or shell scripts) to run periodically
at certain times or dates.
It is commonly used to automate system maintenance or administration.
__Crontab_ (cron table) file, a configuration file that specifies shell
commands to run periodically on a given schedule.
References
- Wikipedia
- Sean Edwards
- Harley Hahn's Guide to Unix and Linux
Demonstration
Demonstration of the indicated keyword.
lab46:~$ at 16:08 warning: commands will be executed using /bin/sh at> echo "hi" at> <EOT> job 319 at Fri Nov 30 16:08:00 2012 lab46:~$ at -l 319 Fri Nov 30 16:08:00 2012 a mwitter3
Experiment 3
Question
if you can use sort -r to reverse the order on the EoCE script in linux
Resources
I know thats what it does but I'm not sure if it will work with the EoCE script.
Hypothesis
I really don't think it will work, but I'm not positive. You never know it might work.
Experiment
Im going to test the experiment by changing the script a little and seeing if it works.
Data
I put sort -r in the script and it didn't seem to work.
Analysis
Based on the data collected:
- Was your hypothesis correct? Yes my hypothesis was correct.
- Was your hypothesis not applicable? I think that it was applicable.
- Is there more going on than you originally thought? (shortcomings in hypothesis) There might be. I might need more in there than just sort -r.
- What shortcomings might there be in your experiment? You might need more than just sort -r
Conclusions
The script in the EoCE is using something different than sort so sort -r is not working. My hypothesis was right but I was kind of hoping that it would work.