6 question about unix and linux

Question Description

Write a single vi OR emacs command to do each of the following. Answer all parts for the same editor: [6]
@. name the editor
1. copy (region between mark and cursor)
2. cut (region between mark and cursor)
3. paste (last cut or copy)
4. save and exit
5. search for a string
6. set a mark
Explain why each of the following IP v4 addresses cannot be assigned to a network interface directly connected to the public Internet: [4]
1. 10.10.10.10
2. 13.255.255.255
3. 42.0.0.0
4. 127.1.1.1
Write an extended regular expression to match each of the following: [4]
1. One underscore or letter (uppercase or lowercase) followed by zero or more underscores, letters, or numerals
2. A number >= 0 and < 10 with or without one or more digits following a decimal point
Write a bash command to assign each of the following to the scaler variable Var: [6]
1. the first character of the variable Str
2. the first element of the array variable Arr
3. the remainder from dividing the integer value of the variable I by the integer value of the variable J
Write a bash command to assign to the array variable Arr the elements of the array variable Brr sorted in numeric order. [2]
Write a UNIX command to do output each of the following from text input: [8]
1. All lines, arranged with the 4th characters in reverse dictionary order
2. Only the first sentence (ending with a period) from each line.
3. All lines, with every space changed to an underscore
4. Only lines which do not contain any spaces

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