How do I add text to the beginning of a file in Bash?

insert_at_the_beginning.sh

echo 'task goes here' | cat - todo.txt > temp && mv temp todo.txt
# OR
cat <(echo "task goes here") todo.txt > todo_new.txt
# OR
echo -e "task goes here\n$(cat todo.txt)" > todo.txt
# OR
sed -i '1s/^/task goes here\n/' todo.txt
# OR
sed -i '1itask goes here' todo.txt