Bash 'for' loop over lines, not words

for_lines.sh

#!/bin/bash

# Only split on newlines, so each line of data is one record.
default_IFS=$IFS
IFS="$(echo -e "\n\r")"

# each $line will be one line, even if there are spaces in it.
for line in $(cat sample_data.txt) ; do
    # do stuff...
done

# Restore default
IFS=$default_IFS