while read line bash code example

Example 1: sh read file line by line

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

Example 2: bash while read line loop from variable

while read -r line
do
 echo "line=[$line]"
done < <(cat jj)

Example 3: bash for each line of file

while read p; do
  echo "$p"
done <peptides.txt

Example 4: read file line loop in bash

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