1. cd ./writing # supposing to be in data-shell/
2. nano haiku.sh
3. for line in Yesterday Today Software; do grep $line haiku.txt >> haiku_software.txt; done
4. bash haiku.sh; cat haiku_software.txt
5. haiku_software.txt would contain 4 lines: the three of the selected haiku, plus Today is a beautiful day (placed in the line after "Today it is not working", since it is called by the second argument of the for cycle)
6. find . -name 'haiku.txt'