How can this be done?

To test a shell script called myscript, the environment variable FOOBAR must be removed
temporarily. How can this be done?

To test a shell script called myscript, the environment variable FOOBAR must be removed
temporarily. How can this be done?

A.
unset -v FOOBAR

B.
set -a FOOBAR=””

C.
env -u FOOBAR myscript

D.
env -i FOOBAR myscript



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