SHELL

Shell read file line by line

while read line; do    
    echo $line    
done < file.txt

bash read file line by line

#!/bin/bash
while read line
do
  echo $line
done < /path/to/file

read file line loop in bash

for word in $(cat peptides.txt); do echo $word; done

bash get line from file

sed 'NUMq;d' file