demo_1209.txt

1. Set up:
	Flash:
		./mklfs -l 32 -s 1024 -b 2 -w 1000 hello1
	Mount: 
		mkdir hello2
		./lfs -i 10 -c 10 hello1 hello2 
	Move to the change:
		cd hello2
	Unmount: 
		fusermount -u hello2
2. Directory manipulation:
	Make single directory:
			mkdir dir
			ls
			rmdir dir
			ls
	Make new single directory to test delete when directory is not empty (because of file):
			mkdir dir
			cd dir
			echo demo please pass >> hope
			cat hope
			cd ../ ~ get out of dir
			rmdir dir ~ will fail
			rm dir/hope
			rmdir dir ~ now pass.
	Make high level directories:
			mkdir dir
			ls
			cd dir
			mkdir sub
			ls
			cd ../
			rmdir dir ~ will fail
			cd dir
			rmdir sub
			cd ../
			rmdir dir ~ success
********************** Restart **************************************************
3. File manipulation:
        ***** make directory up to 4 and manipulate file to lower levels (1 2 3 4)
        mkdir dir 	
        cd dir
        mkdir sub
        cd sub
        mkdir sub2
        cd sub2
        mkdir sub3
        cd sub3
        cd ../ ~ back to sub2
        echo hello >> test
        cat test
        rm test
        cd ../ ~ back to sub
        echo demo day >> demo
        cat demo
        ls
        rm demo
        cd ../ ~back to dir
        echo OS is great >> class
        cat class
        echo because of John >> class
        cat class
        ls
        ******************** Restart it again and start with the root and go down to dir/sub etc*******************************************
        File Write: 
        	echo hello John >> greet
        	cat greet
	File Copy: 	cp greet hw1
			ls
			cat greet
			cat hw1
			echo this is first hw >> hw1
			cat hw1
			cat greet
			ls
			cp hw1 hw2
			ls
			cat hw1
			cat hw2
			echo John is strict grader >> hw2
			echo but John is enthusisatic prof >> hw1
			cat hw1
			cat hw2
	Make new directory:
		mkdir dir
		do the same as above
		but make opinion and then only do cp to hoang rm 
	File remove:
			rm house school
			ls
*******************Restart***********************************
4. Symbolic & Hard Links:
	From within a directory
	Set up
			echo Test Link >> test
			cat test
	Create a symbolic link:
			ln -s test symtest
	Create a hard link:
			link test hardtest
	Check if the symbolic link work:
			cat symtest
	Check the symbolic link file content:
			readlink symtest ~ this will return test
	Change content of original file
			echo new file >> test
			cat symtest
			cat hardtest
	Remove the initial file
			rm test
	Check if the symbolic link work: ~ this will fail.
			cat symtest
			readlink symtest
	Remove the symbolic link:
			rm symtest
			ls
	Check if the hard link work: ~ will return results
			cat hardtest
	Remove the hard link:
			rm hardtest
			ls	
	Now do the same of the above but with file from outside of the directory.
			mkdir dir
			cd dir
			echo outside folder >> ../test
			cat ../test
			ln -s ../test symdir
			link ../test harddir
			cat symdir
			cat harddir
			echo today is thursday >> ../test
			cat symdir
			cat harddir
			rm ../test
			cat symdir
			car harddir
			rm symdir
			rm harddir
	Now two levels apart: 
			mkdir sub
			cd sub
			echo hoang and sunghoon >> ../../authors
			cat ../../authors
			ln -s ../../authors symsub
			link ../../authors hardsub
			cat symsub
			cat hardsub
			echo John likes our demo >> ../../authors
			cat symdir
			cat harddir
			mv ../../authors ../../johnreviews
			cat symdir
			car harddir
			cat ../../authors
			cat ../../johnreviews
			rm symdir hardsub
			rm ../../johnreviews
					
5. chmod / chown (only work on the second level +)
	Prepare:
		echo hello >> test
		ls -l
	Change the file permission
		chmod 771 test
		ls -l
		chmod 666 test
		ls -l
		chmod 777 test
		ls -l
	Change the owner id
		chown sunghoon test
		ls -l
	We can also change owner with ../../test from outside the current folder to create symlink inside.
********************** Restart ***************************************************
6. Tail segment: for tail segment we already so that when we copy file with cp, the original file does not lost content.
	~ Prepare:(Remember address of created file, max 4 files total for checking)
		echo tail segment test >> test1
	~ 	cp test1 test2
		cat test2
		cp test1 test3
		cat test3
		cp test1 test4
		cat test4
		cp test1 test5
		cat test5
		cp test1 test6
		cat test6
		
	~ Check and see that test does not lost content	
		cat test1