Question

I have to do this question using UNIX commands (or terminal on Apple computers)

1. If you have a data file called datafile(below)
   1. Show only line 3
   2. Show only the last line
   3. For all lines that have the string key in it change the word more to other
   4. Print lines that follow this pattern of four characters: the first letter is an m and the last is a n – the two intervening letters can be anything.
   5. Print all lines that do not contain the word ann
   6. Remember that all comment lines begin with a #. Now you want to print all non-

comment lines.

7. Add “.5” to num4 on all lines

This is the contents of datafile

#FirstName LastName more num1 num2 num3 num4

Charles Mainkey more 3.0     .98     3       34

Sharon Key more 5.3     .97     5       23

Patricia Hemenway more 4.0     .7      4       17

TB Savage more 4.4     .84     5       20

AM Main Jr. more 5.1     .94     3       13

Marnot Weber more 4.5     .89     5        9

Ann Stephens more 5.7     .94     5       13

Answer 1

a)

sed -n '3p' datafile

b)

tail -n 1 datafile

NOTE: As per Chegg policy I am allowed to answer specific number of questions (including sub-parts) on a single post. Kindly post the remaining questions separately and I will try to answer them. Sorry for the inconvenience caused.