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blog:spring2016:nburns:journal [2016/03/22 04:06] – nburnsblog:spring2016:nburns:journal [2016/05/10 04:03] (current) – nburns
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 It has been a while since I wrote in the opus.NOTE: However the last time I tried to submit an opus update I had some sort of server error that prevented me from updating. I just completed udr0 far later than I would have wished to. Need to remind myself to ask many more questions than I have been. However udr0 opened my eyes to yet another level of unix magic. This projects main commands consisted of dd, bc, and uses of netpbm programs. I learned to use dd as many different types of tools that I already know such as cat and copy. I also learned that files containing only pieces of a larger file will be hard for the file command to identify. Also take note that when decoding the decoded file automatically shows up in the directory.  It has been a while since I wrote in the opus.NOTE: However the last time I tried to submit an opus update I had some sort of server error that prevented me from updating. I just completed udr0 far later than I would have wished to. Need to remind myself to ask many more questions than I have been. However udr0 opened my eyes to yet another level of unix magic. This projects main commands consisted of dd, bc, and uses of netpbm programs. I learned to use dd as many different types of tools that I already know such as cat and copy. I also learned that files containing only pieces of a larger file will be hard for the file command to identify. Also take note that when decoding the decoded file automatically shows up in the directory. 
 +
 +March 29, 2016
 +
 +Check your units!!!! Always remember when dealing with data that you must know what units you are dealing with. Just finishing up Udr1 and I spent about 3 days trying to figure out what was wrong with my project. Come to find out the main reason for this was that I calculated my bytes wrong when using a dd command to extract partition files. Remember there are 512 bytes in a sector!!! Also remember that partitions have many different formats. Don't forget how to translate little endian to big endian. for the little endian hex number 4321 the big endian is 1234. Questions that I have encountered along the way : How do windows files differ from linux when viewed through a hex editor? How can I better write scripts?
 +
 +April 5, 2016
 +
 +Working more with hex editors with the udr0-3 projects. As far as editors are concerned I need more work with bvi and od. I know od is like cat for binary files and bvi is like hexedit. However I don't know the exact difference between bvi and hexedit. This work with binary files has sparked my interest as to how music editors work in relation to the actual binary code of music. Also this has further piqued my interest in learning more about encoding and compressing files. Another thing I am still very new to is shell scripting. I am still trying to get the hang of how it works but I can definitely see the convenience it allows compared to normal programming.
 +
 +April 11, 2016
 +
 +I Finally understand file permissions alot better! Thanks to urev I don't think I will forget them that easily.
 +Things to Work on:
 +- Understand the actual functions of setUid and like commands
 +- Understanding regular expressions better
 +- Getting better at writing scripts.
 +Things to Remember:
 +-The file permissions are represented in octal.
 +-The first number in 4 number file permission sequence is setuid stuff
 +Things to investigate:
 +-writing a script that can rewrite all file permissions for all files in a directory.
 +-Using loops in scripts
 +- Finding and using other commands such as cut, head, tail, sort, sed, etc.
 +
 +April 18, 2016
 +
 +Been working on the grade calculator this week. I definitely feel like I have greatly progressed as far as script writing and basic usage of regular expressions are concerned. Still have a long way to go before I begin to feel fluent with regular expressions. I have come to find that my greatest obstacle all semester has not been implementing the knowledge that I have learned. But rather finding the information outside of class. Oddly enough the hardest information for me to find is usually more trivial in the grand scheme of things. Something simple like not leaving a space after the "=" assignment operator of a variable is often so much more difficult for me to find than how to actually assign the variable. I definitely feel that my main bottleneck for this Linux class has been locating my desired information outside of class. Maybe this means I should investigate new research strategies. Today I learned that I should start researching all the possible directions my major can go. The more I experiment with what I like to do now, the easier it will be to pick a focus topic down the road.
 +
 +April 29, 2016 (Was attempted to submit on April 26)
 +
 +gfo0 Questions/Sub Tasks:
 +
 +- Capture JUST the PROJECTS category as produced by the status tool?
 +
 + status unix | grep 'final tally'
 +
 +- Determine the total number of projects evaluated? 
 +
 +status unix | grep -v 'bonus' | grep -c 'final tally'
 +
 +- Figure out which project(s) was/were worth the most points? 
 +
 +
 +
 +- Figure out which project(s) was/were worth the least amount of points?
 +
 +
 +
 +- Figure out the total number of project points available?
 +
 +TotPosPoints=`status unix | grep 'final tally' | cut -d')' -f1 |
 +                           cut -d'/' -f2 | tr '\n' '+'`
 +
 +TotPosPoints="${TotPosPoints}0"
 +
 +TotPosPoints=`echo "$TotPosPoints" | bc`
 +
 +echo $TotPosPoints
 +
 +- Determine the total number of points you received on projects?
 +
 +TotActPoints=`cat status | grep 'final tally' | cut -d'/' -f1 |
 +        cut -d'(' -f2 | tr '\n' '+'`
 +
 +TotActPoints="${TotActPoints}0"
 +
 +TotActPoints=`echo "$TotActPoints" | bc`
 +
 +echo $TotActPoints
 +
 +
 +
 +
 +
 +
 +
 +May 10, 2016
 +
 +
 +
 +Final week. Learned alot about looping this week and last week with the eoce projects. I accidentally misread the instructions to the full moon finding script and because of this I added a whole extra "countdown" function that was not even required.  I am feeling pretty confident about linux in general. More importantly I am confident in my ability to find and learn new information as necessary. One thing that struck me interesting earlier today was that I have yet to use the GUI version of linux. One of my fellow students was telling me he recently installed a linux system and is still trying to figure it out. He said it took him forever to install a program. It crossed my mind that I may not have ever done that during this course. Or if I did I guess I didn't totally understand that that is what I was doing. I recently saw a couple open positions for linux administrators. It made me wonder what else I would need to know before I am qualified for that position.
 +
 +
blog/spring2016/nburns/journal.1458619574.txt.gz · Last modified: 2016/03/22 04:06 by nburns

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