Exercice 1
2)
c) grep Paris ratp.csv | grep 13$
d) grep ";13;" ratp.csv
e) grep [sS]ceaux ratp.csv

Exercice 2
1)
b) cut --delimiter=";" -f9 ratp.csv | sort
c) cut -d ";" -f9 ratp.csv | sort | uniq | tr a-z A-Z
e) cut -d ";" -f9 ratp.csv | sort -r | uniq -c | sort -r
f) cut -d ";" -f9-10 ratp.csv | sort -r | uniq -c | sort -r

2)
a)cut -d ";" -f2 ratp.csv | sort -r | uniq -c | sort -r
b)