# Generate list from CSV
list=$(awk -F, '{print $1}' csv_input.csv)

# Create empty output file
echo > output_file.txt

# Loop through list
for i in $list; do

# Output stuff with the list variable
cat << EOF
Stuff and things ${i}
${i} other stuff and things
EOF

# Finish the loop and output to file
done >> output_file.txt