sed remove line containing
sed '/pattern to match/d' ./infile
delete line in sed
sed -e "/your_pattern/d" file
sed -e "/your_pattern/,+2 d" file # 2 lines after the pattern
sed -e '5,5d" # remove 5th line
delete a line starting with sed
# Delete all lines starting with '#'
$ sed -i '/^#/d' filepath