How can I find all the self defined variables and functions to unset?

Question

In a bash shell process, I define some variables and functions here and there. So they are hard to track. How can I find all the self defined variables and functions to unset? Thanks.

Answer 1

Don't try to track which variables and functions you create. Instead, run the code in a subshell. When the subshell completes, all variables and functions defined within the subshell disappear.

In bash, one way to explicitly put commands in a subshell is to place the commands inside parens: (...). For example, let's define two variables and a function within a subshell and execute the function:

$ ( a=1; b=2; fn() { echo "a=$a b=$b"; }; fn )
a=1 b=2

After the subshell completes, all are erased:

$ fn
bash: fn: command not found

Answer 2

Quick and dirty: compare an "empty" environment with your current one

env -i bash set > baseline
set > now
diff baseline now

Answer 3

You can use compgen -v to list all variables defined within bash and compgen -A function to list all the functions