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# check invalid options are rejected
# bash: in posix mode, aborts if non-interactive
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
VAR_RO=1
readonly VAR_RO
unset VAR_RO
echo $? $f $g
unset f VAR_RO g
echo $? $f $g
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