undefine a variable in BASH

Question

In order to save some time typing same phrase many times, I defined some variables in in BASH (not a bash file, just the command line bash). How careless I was to give a variable wrong name foo1 instead of foo. So, I want to undefine foo1.

I know I can set foo1 empty and define foo. By doing this, foo1 is still there and may confuse. I cannot use unset to undefine foo1 because it is not an environment variable.

Question: How to undefine a variable in BASH?

Answer 1

You just need to use the command unset:

unset foo1

It doesn't matter if foo1 isn't an environment variable.

Answer 2

as @BroSlow comments, yes you will use unset:

$ foo1=something
$ foo="something else"
$ set | grep ^foo
foo='something else'
foo1=something
$ unset foo1
$ set | grep ^foo
foo='something else'