In this answer (How can I remove the first line of a file with sed?) there are two ways to delete the first record in a file:

sed '1d' $file >> headerless.txt

** —————- OR —————-**

tail -n +2 $file >> headerless.txt

Personally I think the tail option is cosmetically more pleasing and more readable but probably because I’m sed-challenged.

Which method is fastest?

Which is faster to delete first line in file... sed or tail?