Linux shell script read file line by line

The following are different ways of reading a txt file line by line in linux shell. To fun the following scripts, you should create a “test.txt” file under the same directory with your script.

Method 1

Use file names as parameter to the shell script.

readFile.sh

#!/bin/bash
while read line
do
    name=$line
    echo "Text read from file - $name"
done < $1

Linux command to run:

chmod +x readFile.sh
./readFile.sh test.txt

Method 2

Put file name inside of shell script.

#/bin/bash
file="test.txt"
while IFS= read -r line
do
        # display $line or do somthing with $line
        echo "$line"
done <"$file"

Linux command to run:

. readFile2.sh