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What is an operating system? 2.(5 points) What is the main task of an operating system? 3. (5*3-15 points) Count 5 important functions of an operating system 4. (5 3-15 points) Count 5 currently common major operating systems S. (20 points) Write a bat file to compute sum of any two integer numbers given in the command line First-4 Sum-12 First 4 Sum 13 First-4 Sum--5 CAUsers Vojislav Desktop MS-DOS> 6. (20 points) Write linux command to display on the screen all lines of the given file names.txt which contains "on' or l Akinnuoye, Taiwo Akinwande, Simidele F Ambali, MariamF Aribilola, Samuel I Bolling. Isa J Burrell, Dionna Elias, Joy A Gatobu, Judy M Harris, Trustin L Ivery, Christian A. Monie, Charles A. Mooney, Kaitlyn M. Oum-Mbogba, Amed S Ray, Xavier E Washington, Lee N. Dixon, Chad-Roye R. Dukes, Kamal Leftridge, LaChae K Milligan, Julian X As the proof that you really did it in attach an