bash-scripts/accept_stdin.sh at main · i-stackz/bash-scripts · GitHub

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#!/bin/bash

# this script accepts input that is provided as a parameter ($1) if $1 is emtpy, then it is assigned /dev/stdin (standard input)

# for more info see: https://stackoverflow.com/questions/6980090/how-to-read-from-a-file-or-standard-input-in-bash

########
# code #
########


# while loop that prompts for input and stores it within variable LINE
while read -p 'Enter Input: ' LINE
do
	# if statement to check if user inputs 'exit'
	if [[ $LINE == 'exit' ]]
	then
		# break out of while loop
		break;
	else
		# output user input
		echo -e "\nYou've inputted: $LINE\n";
	fi
done < "${1:-/dev/stdin}" # sends STDIN to the command

# NOTE: the line "${1:-/dev/stdin}" is a way to check if $1 is empty, if it is, then it is assigned the input from /dev/stdin (standard input).


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###########################################################