Move cursor over filenames and pipe "|" symbols to see intermediate results, click on them to see, full data

Show all city names, which belong to more than one city (together with the number of cities with this name):
cut -d, -f1 data/city.csv | sort | uniq -c | sort -nr | awk '$1 > 1' > result.txt [output]
Count the number different words (case insensitive) from the book Moby Dick and sort them decreasing by the number of times they appear):
grep '[A-Za-z]+' -Eo data/moby-dick.txt | tr 'A-Z' 'a-z' | sort | uniq -c | sort -nr [output]