Read the bash man or info page, try some experiments, and answer the following questions:

a. How do you export a function?
b. What does the hash builtin do?
c. What happens if the argument to exec is not executable?

a. $ export -f funcname
b. The hash builtin remembers the absolute pathnames of executable pro-
grams named in its arguments. Without any arguments, hash lists all of
the commands it is tracking.
c. When the argument to exec is not an executable file, exec fails.