sed usage statistics

#match the string and display the line number
sed -n -e '/`epg`/=' -e'/`epg`/p' 1.txt

# print line 10
sed -n '10p' 1.txt

# print lines 10 to 20
sed -n '10,20p' 1.txt

#delete line 40
sed -i '40d' 1.txt

#delete lines 5 to 7
sed -i '5,7d' 1.txt