HackerRank Tail of a Text File #1 problem solution

In this HackerRank Tail of a Text File #1 problem solution In this challenge, we practice using the tail command to display the last n lines of a text file.

Display the last 20 lines of an input file.

Input Format

A text file.

Constraints

Output the last 20 lines of the text file.

Problem solution.

tail -n 20

Second solution.

#!/bin/bash
tail -n 20 $1

Third solution.

touch buffer

while read line
do
    echo $line >> buffer
done
tail -n 20 buffer