SHELL

linux remove last line from file

sed '$d' <file>
sed -i '$d' <file> # to edit in place

linux remove last n lines from file

#remove last 80 lines from cars.csv
head -n -80 cars.csv > tmp.csv && mv tmp.csv cars.csv

bash delete the last line of a file

# Basic syntax:
sed -i '$d' input_file

# Note, -i means that the input_file will be modified in place