busybox/shell/hush_test/hush-vars/unset.tests

# check invalid options are rejected
unset -
echo $?
unset -m a b c
echo $?

# check funky usage
unset
echo $?

# check normal usage
echo ___
f=f g=g
echo $? $f $g
unset f
echo $? $f $g
unset g
echo $? $f $g

echo ___
f=f g=g
echo $? $f $g
unset f g
echo $? $f $g
f=f g=g
echo $? $f $g
unset -v f g
echo $? $f $g

# check read only vars
echo ___
f=f g=g
unset HUSH_VERSION
echo $? $f $g
unset f HUSH_VERSION g
echo $? $f $g