0.input.txt

1, Ju3stin T3imb3erlake, Title 545, Price $7.30
2, Tayl4or Sw4ift, Title 723, Price $7.90
3, Mi4ck J3a2gger, Title 610, Price $7.90
4, La3dy Ga243ga, Title 118, Price $7.30
5, Joh234nny C3ash, Title 482, Price $6.50
6, Elvis Presl4ey, Title 335, Price $7.30
7, 444John Lennon4444, Title 271, Price $7.90
8, 444John Lennon4444, Title 271, Price $7.90
9, 444John Lennon4444, Title 271, Price $7.90
10, Ju3stin T3imb3erlake, Title 545, Price $7.30
11, Ju3stin T3imb3erlake, Title 545, Price $7.30
12, Ju3stin T3imb3erlake, Title 545, Price $7.30
13, Ju3stin T3imb3erlake, Title 545, Price $7.30

1. thoughtput.md

• load input.txt (cat)
• split the csv and take the artist name on a artist list (gawk)
• clean the artist names, remove numbers (sed)
• order the artists list to group them (sort)
• group the unique artists and count the incidences (uniq)
• order by number of incidences (sort)
• get top 3 list (head)

cat input.txt | gawk -F", " '{print $2}' | sed "s/[0-9]//g" | sort | uniq -c | sort -r -n | head -3

2. output.txt

5 Justin Timberlake
3 John Lennon
1 Taylor Swift