Sed #sed
#print even lines from file
sed -n '2~2p' filename
#print odd lines from file
sed -n '1~2p' filename
#print every n'th line from m lines n=3 m=5
sed -n '3~5p' filename
#print even lines from file
sed -n '2~2p' filename
#print odd lines from file
sed -n '1~2p' filename
#print every n'th line from m lines n=3 m=5
sed -n '3~5p' filename