gistfile1.txt

sjohnson@web1:~/http$ animal() { echo pig ; }
sjohnson@web1:~/http$ animal
pig
sjohnson@web1:~/http$ type animal
animal is a function
animal ()
{
    echo pig
}
sjohnson@web1:~/http$ unset animal
sjohnson@web1:~/http$ type animal
-bash: type: animal: not found