HackerRank Head of a Text File #1 problem solution

In this HackerRank Head of a Text File #1 problem solution In this challenge, we practice using the head command to display the first 20 lines of a text file.

Display the first 20 lines of an input file.

Input Format

A text file.

Output Format

Output the first 20 lines of the given text file.

We can also specify a certain number of lines to be displayed and list multiple filenames as well. It may also be used to display a specified number of bytes from an input file.

Problem solution.

#!/bin/bash
file= 'cat /dev/stdin'
head -20 $file

Second solution.

head -n 20

Third solution.

head -20