How do I use bold font in terminal? (echo/cat)

Here's how:

echo -e "text \033[1mbold\033[0m text"

See "Colorizing" Scripts tutorial.

It's not possible to do for cat that way. cat will merely print the characters of the file onto standard out. The closest thing I can come up with is the following:

If you put text \033[1mbold\033[0m text you can do

echo -e `cat test.txt`