sed remove line containing code example

Example 1: sed remove line containing

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

Example 2: delete a line starting with sed

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

Example 3: 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 #

Example 4: remove line with pattern

Use d option at the end of sed command string for deleting line of matches.
sed -i "" "s/matching_pattern/d" file.txt