Question: in ubuntu. 3 . Write a program to print characters starting from 1 5 th character till the 2 0 th character of file F

in ubuntu. 3. Write a program to print characters starting from 15 th character till the 20 th character of file F1.txt into file F4.txt.4. Write a program to read a number(\( n)\) from the user. Print the first \( n \) characters from the file F1.txt.5. Write a program to print the second half of a file.

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