SHELL

read file using shell script

#!/bin/bash
input="/path/to/txt/file"
while IFS= read -r line
do
  echo "$line"
done < "$input"

read the file from shell

#!/bin/sh
value=`cat config.txt`
echo "$value"

#!/bin/bash
value=$(<config.txt)
echo "$value"

bash read file

#if you want to display the contents of a file on the terminal, do:
$ cat filename.file