Looping through the content of a file in Bash?

Looping through the content of a file in Bash?

This is a very common question for everyone who works on Unix or Linux operating systems.

The answer is quite simple, use “read” command in combination with a named pipe or an unnamed pipe.

The code

Here you have #2 possible options that will help you to achieve this goal. 

They do exactly the same, so pick up which looks best suitable for your coding style:

Option #1

cat file.txt | while read line
  do
    echo "processing line: $line"
  done

Option #2

while read line
  do
    echo "processing line: $line"
  done < file.txt

Super easy!