Omit lines from the beginning or end of a file in Bash

Question

Given a text file a.txt, how to cut the head or tail from the file?

For example, remove the first 10 lines or the last 10 lines.

Answer 1

to list all but the last 10 lines of a file:

head -n -10 file

to list all but the first 10 lines of a file:

tail -n +10 file