# e = run script, $a\ means append following text, but there is none,
# so sed only does what it always does when it was supposed to modify a file,
# which is append a newline if there was none.
# e = run script, $a\ means append following text, but there is none,
# so sed only does what it always does when it was supposed to modify a file,
# which is append a newline if there was none.