Looping through the content of a file in Bash

Question

How do I iterate through each line of a text file with Bash?

With this script:

echo \"Start!\"
for p in (peptides.txt)
do
    echo \"${p}\"
done


        

Answer 1

Use a while loop, like this:

while IFS= read -r line; do
   echo "$line"
done <file

Notes:

1. If you don't set the IFS properly, you will lose indentation.

2. You should almost always use the -r option with read.

3. Don't read lines with for