How to Replace the nth Occurrence of a Pattern in a Line Using a sed Command

Insert the corresponding character, either a slash ( / ) or a vertical bar ( | ), and substitute the hash ( # ) symbol with the desired number to replace the nth occurrence of a pattern in a line. Here's the basic syntax:

sed ‘s/old_string/new_string/#’ samplefile.txt

For example, to replace the first occurrence of the word "music" with "song" in a line inside the playlist.txt file, enter:

sed ‘s/music/song/1’ playlist.txt