Sed remove line containing

sed '/pattern to match/d' ./infile

Delete a line starting with sed

# Delete all lines starting with '#'
$ sed -i '/^#/d' filepath

Delete line in sed

# -i here update the file, try with and without -i, 
sed -i -e "/your_pattern/d" file 
sed -i -e "/your_pattern/,+2 d" file  # 2 lines after the pattern
sed -i -e '5,5d" file # remove 5th line

Sed delete line before match

Use d option at the end of sed command string for deleting line of matches.
tac | sed -i "" "s/matching_pattern/I+1 d" file.txt | tac #

Sed remove line

$ sed 's|http://||' <<EOL
http://url1.com
http://url2.com
http://url3.com
EOL

Source: catonmat.net

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