Question

1.) If the commands below will be executed in order, determine the output of the 4 echo commands (labeled as A-D): (2 Marks) ra7 export b=9 echo $r 9=3 echo $b -B be8 bash echo $g exit echo $b -D exit ii.) Given the contents of file (filename: /home/user5/table) below, write the single command line needed to perform the following tasks. 7 2 Services 1 Executive Summary 1.1 Olives 12 6 Financial Plan Important Assumption Startup Funding Requirements Other Current Assets 62 Break even Analysis Appendix 12 Months Forecast (12-Month Detal) 12 Month Personne Forecast (12-Month Detal) 12.Month Profit & Loss Forecast (12-Mon ) 6 6 14 14 15 16 16 21 22 23 2.) Display the first two lines of the file and sort the output based on the numbers on the right (7,5) in increasing order. (1.5 Marks) b.) Count the number of lines in the file which does not include the 3 lines under Appendic. (1.5 Marks) c.) Display the lines in between Executive Summary and Financial Plan (Objectives and Mission) translated trom upper to lowercase characters and redirect the output to a file named contentout under your working directory. ( 2 Marks)

Answer 1

i) Let's see the execution first and then output followed by explanation :

  $ r=7 ~$ export b=9 ~$ echo $r 7 ~$ sh $ g=3 $ echo $b 9 $ b=8 $ bash ~$ echo $g ~$ exit exit $ echo $b 8 $ exit

As above run window shows, we will go through oututs and their explanations,

A) As we have set the value of r as 7 in same shell, output will be 7.

B) Even though we have changed shell after executing A, as we had exported value of b = 9, in sh also, it will output the same value as 9.

C) After that, we are going back to bash shell, so since we had set value of g in sh shell, bash will have no value of variable g hence output is blank.

D) After exiting from bash, we areback to shell sh where we had set b=8, hence output of command D is 8.

ii) I have inputted the whole text file as below in shell for better demonstration :

 ~/Ashu$ cat table 2 Services 7 1 Executive Summary 5 1.1 Objectives 6 1.2 Mission 6 6 Financial Plan 14 6.1 Important Assumptions 14 Startup Funding Requirements 15 6.1.1. Other Current Assets 16 6.2 Break even Analysis 16 Appendix 12-Month Sales Forecast(12 Month Detail) 21 12-Month Personal Forecast(12-Month Detail) 22 12-Month Profit & Loss Forecast(12-Month Detail) 23 ~/Ashu$ 

Now we can proceed with commands and their outputs :

a)  head -2 table |sort -k3 -n

 ~/Ashu$ head -2 table |sort -k3 -n 1 Executive Summary 5 2 Services 7

head -2 table prints the first two lines of the file while sort -k3 -n sorts the output on the basis of third column numerically.

b) sed -n '/Appendix/{=; q;}' table

 ~/Ashu$ sed -n '/Appendix/{=; q;}' table  10

Above command counts the number of lines using sed until certain pattern is foound. As the requirement was to include the Appendix line the count is 10.

c)  sed -n '/Executive Summary/,/Financial Plan/p' table | head -n -1| tail -n +2 | tr '[:upper:]' '[:lower:]' > content.out

 ~/Ashu$ sed -n '/Executive Summary/,/Financial Plan/p' table | head -n -1| tail -n +2 | tr '[:upper:]' '[:lower:]' > content.out ~/Ashu$ ~/Ashu$ ~/Ashu$ cat content.out 1.1 objectives 6 1.2 mission 6

In above command,  sed -n '/Executive Summary/,/Financial Plan/p' table fetches the lines between given two patterns, head -n -1| tail -n +2 removes files including patterns, tr '[:upper:]' '[:lower:]' converts the case of Objectives and Mission to lowercase and finally > content.out redirects it to desired filename in currently working directory.

So in above way, we can achieve desired outputs.