Part Numero Uno

Professor Haas showed and explained VI/VIM to the class:

• Learned that is was created by Bill Joy and that it was the first full screen.
• I learned how to navigate, enter text, and other commands.
• VI is a visual editor which has a insert mode and command mode
• Still trying to remember the commands, and understand which one is to be used when. But once I understand it I will be a genius.

This day gimmeh was introduced and a little information on scripts:

• Gimmeh a neat program notifying when assignments are due, and has a count down
• I also learned how to view how many times I have logged in
• Learned how to create and run a script, script file is known as logincnt.sh
• System is starting to pick up with me a little more.

Today we learned about Wildcards, to me seems very tricky stuff:

• wild cards are the following
  • * - match 0 or more of any characters
  • ? - match 1 of any characters
  • [ ] - character class; match 1 of any of the enclosed characters
  • [^] - inverted character class; do not match 1 of any of the enclosed characters
• wild cards are basically a search to help us find the information we are looking for
• Wild cards also show how many of the files have what characters
• I will have troubles remembering commands and I may not use much of this because I am rather the bad lazy type of person

Learning more on shell scripting:

• Commands on shell scripting in VI
  • Echo; to output information to the user
  • read; to input information from the user into a variable
  • $RANDOM; environment variable which gives me a whole bunch of ranged random whole numbers
  • if; statements enabling us to make boolean choices
  • fi; closing the statements of if
  • else; statement to contain the countering action
  • -eg ; equal
  • -ne ; not equal
  • -gt ; greater
  • -ge ; greater than or equal to
  • -lt ; less than
  • -le ; less than or equal
  • exit; force termination of script
• we created scripts that would give random numbers that we try to guess and it would tell us “correct” “wrong”
• Learned how to use the bc inside of the script to minimize the numbers
• I may have a little trouble remembering the commands, but I think I would like to create a script that actually talks with me

Using wild cards, how would it change my search by adding or taking out a character out of the string?

Using the skills, and information learned in class.

My hypothesis, by just changing one character or adding one from the string typed will make a difference in the results.

Using the command ???? to search for directories, then I will change one thing and then add one thing to see what the results are.

I will be working in files in sbin

using the command: ls -d ???? Result: dump fsck halt ifup init mkfs rarp Changing the command to ls -d ???* the result: I received way to much Changing the command to ls -d ????? the result: blkid fdisk getty lsmod rdump rmmod route rtmon udevd Changing the command to ls -d ?????? the result: agetty depmod e2undo ifdown mke2fs nameif rtacct swapon wipefs cfdisk e2fsck findfs insmod mkswap reboot sfdisk sysctl

this gave me every word that was at least four letters, then a result I did not intend for, then every word that was a least five letters, then the next with words that had six letters.

Based on the data collected:

• My hypothesis is correct
• No short comings. You have to be accurate with what you type to get the items you require

That by just changing or adding one character in a command string it will change the results from the previous string