Added Lab3

cs251_group25/Lab3/lab03_group25_inlab/configurePasswordLessEntry.sh

+#!/bin/bash
+ssh-keygen -t rsa
+ssh-copy-id -i ~/.ssh/id_rsa.pub $1"@"$2
+ssh $1"@"$2
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_inlab/infiniteLoop.sh

+#!/bin/bash
+while :
+do
+	sleep 0.5
+done
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_inlab/myBashCustomization.sh

+#!/bin/bash
+
+#subtask 3 
+PS1='${debian_chroot:+($debian_chroot)}\u@\h - \t [\W]:\$ '
+# \t is used to display the time in hh:mm:ss format
+# \W displays the current directory
+
+#subtask 4
+alias bk="cd \$OLDPWD"
+#aliases bk to cd \$OLDPWD, '\$' to escape $
+
+#subtask 5
+echo -e "\033[51;31m@           @         \033[0m"
+echo -e "\033[12;31m@           @                \033[0m"
+echo -e "\033[53;61m@           @           \033[0m"
+echo -e "\033[01;31m@           @           \033[0m"
+echo -e "\033[01;32m@-----------@             \033[0m"
+echo -e "\033[01;31m@           @              \033[0m"
+echo -e "\033[01;31m@           @               \033[0m"
+echo -e "\033[01;31m@           @     \033[0m"

cs251_group25/Lab3/lab03_group25_inlab/readme.txt

+Group 25 Marauders
+
+(Shaan Vaidya 150050004) (Abhishek Kumar 150050020) (Vishwajeet Singh Bagdawat 150050046)
+
+I pledge on my honour that I have not given or received unauthorised assistance on this assignment or any previous task. -Shaan
+
+I pledge on my honour that I have not given or received unauthorised assistance on this assignment or any previous task. -Abhishek
+
+I pledge on my honour that I have not given or received unauthorised assistance on this assignment or any previous task. -Vishwajeet
+
+Contribution:
+Shaan : 100% 
+Abhishek: 100%
+Vishwajeet: 100%
+
+Citations:
+www.tutorialspoint.com/unix_commands/ 
+	- grep, tr, cut etc.
+https://support.suso.com/supki/SSH_Tutorial_for_Linux 
+	- ssh 
+http://rcsg-gsir.imsb-dsgi.nrc-cnrc.gc.ca/documents/internet/node31.html 
+	- ssh-keygen (generate ssh key)
+http://linux.die.net/man/1/ssh-copy-id 
+	- ssh-copy-id (copy the key to remote server) 
+
+Extra credits attempted:
+Task A 5
+Task C 4
+
+Task A:
+Bash manages autocomplete using 'readline' library which in turn provides functions for applications that allow users to edit command lines.
+When tab is pressed, readline calls back to bask which in turn returns a list of possible completions. Readline then inserts as many characters that are common for all functions.
+Bash also has a builtin 'complete' function to define how to complete commands. First it matches with commands, if nothing then file names. One can also customise this.
+Bash also stores history and stores size in HISTSIZE variable. Can be seen using history.
+
+Task B:
+'meminfo' file in the /proc directory contains information regarding memory usage
+
+Command used for the task:
+grep -w 'MemTotal\|MemFree' meminfo | tr -d " " | cut -d \: -f 2 
+
+	grep searches for the words (-w option) MemTotal and MemFree in meminfo. \| is used to escape the pipe operator as 'or'. 
+
+	tr translates the data. -d option with " " argument removes spaces.
+
+	cut -d separates the data by delimiter ':'. -f option helps select data fields in output which is '2' in this case. 
+
+
+
+Task C:
+Command used for 'ssh'ing : ssh shaan@mars.cse.iitb.ac.in
+Command used for graphical output on local machine: ssh -X shaan@cse.iitb.ac.in
+	-X option enables X11 forwarding onto the local machine
+
+
+Task D:
+./infiniteLoop.sh & 
+OR
+source infiniteLoop.sh &
+	'&' runs the script in the background directly; instead one could use bg to throw the process to background. (source infiniteLoop.sh was used as the alternative gave a 'permission denied' error) We looked this up on the internet
+
+ps -aux | grep infiniteLoop.sh 
+	- get pid
+kill [process-id]
+OR
+pkill [script-name]
+
+	We started with bringing the process to foreground and then kill it but obviously it was wrong as it killed all fg processes. So we used kill [process-id] but that required to first look up the process-id using 'ps -aux' piped with grep.
+	pkill [script-name] kills the process started by the script whose name we passed as argument.
+
+
+
+
+
+

cs251_group25/Lab3/lab03_group25_outlab/readme.txt

+Group 25 Marauders
+
+(Shaan Vaidya 150050004) (Abhishek Kumar 150050020) (Vishwajeet Singh Bagdawat 150050046)
+
+
+I pledge on my honour that I have not given or received unauthorised assistance on this assignment or any previous task. -Shaan
+
+I pledge on my honour that I have not given or received unauthorised assistance on this assignment or any previous task. -Abhishek
+
+I pledge on my honour that I have not given or received unauthorised assistance on this assignment or any previous task. -Vishwajeet
+
+
+Contribution:
+Shaan : 100% 
+Abhishek: 100%
+Vishwajeet: 100%
+
+
+Regarding restricting login only through cURL or wget:
+*Maybe* as cURL does not support JS or cookies, one can detect if the site is being accessed through the browser or cURL.
+
+Regarding terminal not displaying the pokemon:
+*Maybe* as the terminal does not support all characters, they just get ignored alongwith the recognised characters in between while html just ignores them and prints the one it knows.
+
+
+Reflection Essay:
+Bash scripting is amazing! The time when you are able to successfully run a dictionary attack is gold (Note: I *might* be exaggerating). Firstly, kudos to the ones who constructed the whole set. Besides a lot, we also learnt how to Google. cURL and Ncat is a lot of power on the command line. Regex is fun though confusing at times; an infinite number of syntaxes. sed took some time to learn. Dictionary attack was fun! 
+
+
+Citations:
+http://alvinalexander.com/unix/edu/examples/find.shtml - find 
+http://www.binarytides.com/linux-find-command-examples/ - find
+http://droptips.com/using-grep-and-ignoring-case-case-insensitive-grep
+https://www.gnu.org/software/grep/manual/grep.html - grep
+http://www.windytan.com/2013/09/lan-file-transfer-with-netcat.html - Ncat
+http://teaching.idallen.com/dat2330/04f/notes/exit_status.txt - Exit statuses, for dictionary attack success
+http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_09_01.html - for loop
+https://bash.cyberciti.biz/guide/If..else..fi - if construct
+http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_09_02.html - while loop
+https://curl.haxx.se/docs/httpscripting.html - cURL
+http://www.computerhope.com/unix/urm.htm - rm
+http://www.compciv.org/topics/bash/variables-and-substitution/ - variables
+https://www.gnu.org/software/gawk/manual/html_node/Printf-Examples.html - awk
+http://unix.stackexchange.com/questions/177309/output-both-stderr-and-stdout-on-console-and-store-them-in-a-file-at-same-time - output redirection
+http://searchnetworking.techtarget.com/definition/client-server - Read about client-server model
+http://www.computerhope.com/jargon/n/netmask.htm - Read about Netmask
+http://www.computerhope.com/unix/uifconfi.htm - Read about ifconfig
+http://portforward.com/networking/whatisport.htm - reading for ports 
+http://portforward.com/networking/whatisip.htm - reading for IP Address
+http://tldp.org/LDP/abs/html/x23170.html - Looked up about sed
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskA.txt

+Tokyo
+home/abhishek/Desktop/3rd Sem/CS251/This year Labs/Lab3/Earth/Asia/
+find Japan/ -iname "T*" ! -executable -size +50k -size -100k -user abhishek ! -writable| xargs gedit
+cd
+ls
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskB.txt

+GRASS Sceptile
+/home/abhishek/Desktop/3rd Sem/CS251/This year Labs/Lab3/Earth/Asia/China/
+grep -i  '^\(grass\|water\)\s\w[^bm]\{6,10\}$' Shanghai
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskC.txt

+Magikarp
+rm -r */ 
+rm A*
+rm {1..20}
+rm *.jpg
+cat $(ls -x) > ultraball.html
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskD.txt

+Squirtle
+alpha omega
+curl -s https://www.cse.iitb.ac.in/~sharat/current/cs251/Assign/Lab03/support/verify.php -d "username=alpha&password=omega"

cs251_group25/Lab3/lab03_group25_outlab/taskE.txt

+cf3c122f1dabdc0fc4e1c37a25556bc8
+f24109a62a0422577119abeb0db4f801
+10.42.0.144
+10.42.0.146
+nc 10.42.0.146 12345 < Bulbasaur;	nc -l 12345 > Slowpoke
+nc 10.42.0.144 12345 < Slowpoke;	nc -l 12345 > Bulbasaur

cs251_group25/Lab3/lab03_group25_outlab/taskF.sh

+#!/bin/bash
+file --mime-type * | grep 'text/x-c' | tr -d " " | cut -d \: -f 1 | while read f; do mv "$f" "$f.c"; done
+file --mime-type * | grep 'application/gzip' | tr -d " " | cut -d \: -f 1 | while read f; do mv "$f" "$f.gz"; done
+file --mime-type * | grep 'image/jpeg' | tr -d " " | cut -d \: -f 1 | while read f; do mv "$f" "$f.jpg"; done
+file --mime-type * | grep 'text/html' | tr -d " " | cut -d \: -f 1 | while read f; do mv "$f" "$f.html"; done
+
+#code to compile the files
+# gcc *.c -o output
+# ./output 2>&1 > masterball
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskF.txt

+ROTOM
+application/gzip
+image/jpeg
+text/html
+text/x-c
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskG.txt

+Magikarp
+ls -ltr | awk '{print $5}'
+
+for the final printing of characters
+ls -ltr | awk '{printf "%c", $5}'
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskH.txt

+Hawlucha
+sed -i -- 's/\(flying\|fighting\)/255 0 0/g' corruptedPokémon.ppm
+sed -i -- 's/\(Def\|Sp.A\|Sp.D\|Atk\):1[0-9][0-9]/255 8 153/g' corruptedPokémon.ppm
+sed -i -- 's/HP-\([0-9][0-9][0-9]\)\/[0-9][0-9][0-9]/\1/g' corruptedPokémon.ppm
+sed -i -- 's/HP-\([0-9][0-9]\)\/[0-9][0-9]/\1/g' corruptedPokémon.ppm
+sed -i -- 's/HP-\([0-9]\)\/[0-9]/\1/g' corruptedPokémon.ppm
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskI.sh

+#!/bin/bash
+yes | 
+for a in `cat dictionary.txt`; do 	
+	unzip -qq -P $a legendaryPokemon.zip; 	#-qq quieter, remove error messages
+		if test $? -eq 0;					#$? returns 0 if status success
+			then printf "\n $a \n";					
+		fi
+	done
\ No newline at end of file

cs251_group25/Lab3/lab03_group25_outlab/taskI.txt

+Mewtwo
\ No newline at end of file