Table of Contents
Part 3
Entries
Entry 1: November 7, 2012
This is confusing first I get
lab46:~$ ./setup.exe I see you've made it this far. The end is in sight. cat: ./setup.exe: No such file or directory When you figure it out, you want field: 2
Then I get
lab46:~$ ./setup.exe Not ready yet.
Entry 2: November 14, 2012
lab46:~$ cat datafile | cut -d~ -f2 | sed 's/@/\n/g' | sort -h -r | less
Entry 3: November 16, 2012
Learned how to do xeyes but with different images. xloadimage.
Entry 4: November 30, 2012
Last day of November. EoCE today.
Keywords
unix Keyword 3
dd
Definition
Convert and copy a file.
References
unixhelp.ed.ac.uk/CGI/man-cgi?dd
unix Keyword 3 Phase 2
Comm
Definition
“comm” is a UNIX command which can be used to compare two sorted files. The input for comm is two files, and the output is two separate columns. The command syntax for comm is
comm [OPTION]... FILE1 FILE2
comm has three main options, -1, -2, and -3.
The -1 option will print the lines present in FILE1 in the left hand column, and all common lines in the right hand column, whereas the -2 option will do the opposite (print lines present in FILE2 on the left, and common lines on the right). The -3 option, however, will only print lines unique to both files, with FILE1's unique lines being on the left, and FILE2's unique lines on the right.
References
- man comm!
lab46:~/src/unix$ comm -3 blah test #script 3 comm: file 1 is not in sorted order # echo -n "enter a number: " read number comm: file 2 is not in sorted order echo -n "How many times: " read times for((i=$number; i<$times; i**)); do let x=i*i echo "[$i] $x" done value=`$RANDOM` echo $value echo -n "Guess a value: " read num if [ $num -eq $value ]; then echo "You are correct" elif [ $num -gt $value ]; then echo "Too high" else echo "Too low" fi
Experiment 3
Question
Can you throw xeyes/xlogo/xloadimage on to a computer without someone logged in.
Resources
Matt
Hypothesis
I believe you can.
Experiment
Try to send xeyes or whatever to a computer not in use.
Data
grrasp:~$ xeyes -display flake02:5 & [1] 20395 grrasp:~$ xeyes -display flake02:5 & [2] 20396 grrasp:~$ xeyes -display flake02:5 & [3] 20397 grrasp:~$ xeyes -display flake02:5 & [4] 20398 grrasp:~$ xeyes -display flake02:5 & [5] 20399 grrasp:~$ xeyes -display flake02:5 & [6] 20400 grrasp:~$ xeyes -display flake02:5 & [7] 20401 grrasp:~$ xeyes -display flake02:5 & [8] 20402 grrasp:~$ xeyes -display flake02:5 & [9] 20403 grrasp:~$ xeyes -display flake02:5 & [10] 20404 grrasp:~$ xeyes -display flake02:5 & [11] 20406 grrasp:~$ xeyes -display flake02:5 & [12] 20407 grrasp:~$
Did this while someone was not logged in at 15:32 November 30th 2012.
Analysis
I was correct in my idea that xeyes/whatever would work.
Conclusions
This could be fun as a jock to play on people.