//part 2

1. du: //gives the information about the disc accoupied by a file or folder

    du directory_path // to see usage of that folder

    du -h directory_path // in human format

    du -sh directory // -s flag for getting size of complete directory instead of each file

    du -m directory // gives data in MBs

    du -h direcotry_path --exclude="file" // get data of all excluding certain file pattern

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2. head: // command that allows you to view first 10 lines of the file

    head -n 5 file.txt // prints first five lines

    head -5 file.txt // this command works same as above

    head -n -5 file.txt // this print all the first lines except last five

    head -q file.txt file2.txt // this quits printing file names as a headers

    head -c 2 file.txt // outputs the no. of bytes  

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3. tail: // command that allows to view last 10 lines of a file

    tail -3 file.txt // prints last three lines

    tail -n 3 file.txt // works same as above

    tail -c 50 file.txt // it will print last 50 bytes from the file

    tail -f file.txt // this will monitor file for the change -f meaning follow

    tail -q file.txt file2.txt // this will not print file name as headers

    tail -v file.txt // -v verbose this will print file names as header

4. diff:// shows the difference between two files

    diff -c file1.txt file2.txt // show the diff in context form

    diff -u file1.txt file2.txt // show the diff output without any redandant information

    diff -i file1.txt file2.txt // makes the diff command case insensative

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5. tar://this command archives multiplle files into TAR file