#!/usr/bin/env bash
# This script prints the middle line of a file (approximately).
#
# I use it to do binary searches on a file.
#
# See https://www.unix.com/unix-for-dummies-questions-and-answers/248556-find-display-middle-line-file-using-single-line-command.html

set -o errexit
set -o nounset

awk '{a[b++]=$0;}END{print a[int(b/2)];}' "$@"