Using linux ubuntu operating system to write the following? 1-Create a file names as index.txt. Write some phrases in the file, and then print first three lines in the file. Finally print the file line by line. 2-Search for any file that is larger than 1000k. 3-Create a nm.txt. file Write some phrases in the file. Match lines containing "a", "m" and "s" characters. Prints all lines in the file that begin with the letter "C". 4-Display the files in /etc/passwd and move both forward and backward in the file while the command is running. 5-Find and display all the directories in the directory /etc/apm. 6-Using sort command to sort the directory /etc/passwd by the 3rd field (numeric userid)