ObiLab - BASH Scripting

Final Test

Check the content of the file finaltest.txt, then
You need to check how many occurrences of more than one string happens into the file.
Look for the string GATTACA and QUIGATTACICOVA
Count the quantity of each matched pattern and at the end report the most frequent string in the file
As a last step, look for a string, for example, GATTACA, and replace it with the string OBILAB. You can develop the script top-down, but if you feel particularly skilled... I would like to remind you to use functions and to check as many parameters as possible.
Take care, you will have to use nano or vim. Not Gedit or any other GUI editor
The name of the file and strings must be used as arguments or acquired via standard input

cat finaltest.txt 
This file is for final test.
stefano IT unina GATTACAGACTACTTAAGCTACTTGCTACAAACTAACTGGTTACAAATAGATAGATAG
marco bio unina GATTACAGACTACTTAAGCTACGATTACAAAACTAACTAAGCTACGATTAAAGCTACGG
mario IT igb GATTACAGACTACTTAAGCTACTTGCTACAAACTAACTAAGCTACGATTAAAGCTACGTCGC
serena bio unina ATCGATTCCCGGAQUIGATTACICOVATCATGGATTCCAGTTTAAGGCCCCGATATCC

Here is the output of my version of the test...

./myversion.sh
Enter the name of the file to filter  finaltest.txt
How many strings do you want to search? : 2
You've entered the Integer: 2
Insert the string 0 : GATTACA
Insert the string 1 : QUIGATTACICOVA

Let's highlight all occurencies of the word  GATTACA 
 
stefano IT unina GATTACAGACTACTTAAGCTACTTGCTACAAACTAACTGGTTACAAATAGATAGATAG
marco bio unina GATTACAGACTACTTAAGCTACGATTACAAAACTAACTAAGCTACGATTAAAGCTACGG
mario IT igb GATTACAGACTACTTAAGCTACTTGCTACAAACTAACTAAGCTACGATTAAAGCTACGTCGC

Now count the matches of the word on each line 
Found the word  GATTACA  on  3  lines
Found the word  GATTACA  a total of  4  times

Let's highlight all occurrences of the word  QUIGATTACICOVA 
 
serena bio unina ATCGATTCCCGGAQUIGATTACICOVATCATGGATTCCAGTTTAAGGCCCCGATATCC

Now count the matches of the word on each line 
Found the word  QUIGATTACICOVA  on  1  lines
Found the word  QUIGATTACICOVA  a total of  1  times
Max matches of the word  GATTACA  is  4 
Min matches of the string  QUIGATTACICOVA  is   1 
Which string do you want to replace? : GATTACA
What do you want to write instead of GATTACA : OBILAB
Which file would you like to edit? (irreversible) : finaltest.txt
Verifica file di Log per il risultato
shady@debian8vm:~/obiDir$ 

That's my version of the final test, feel free to use my functions as you prefer.