Tiago Tavares

Eliminate first line in a text file (-i edit files in place; -e add the script to the commands to be executed)

$sed -i -e "1d" copy.csv

Find and substitute pattern globaly

$sed -i -e s/pattern/substitute/g copy.csv

Find pattern in the first line, save it, and substitute with a string that uses that pattern (number preceded by ,")

sed -i.bak '1s/,"\([0-9]\)/,"d\1/g' copy.csv