$: TEST=this    #-- your shell might need to 'export' explicitly
$: echo $TEST
this
$: TEST=that eval 'echo $TEST'
that
$: echo $TEST
this

##</code><code>##

PERL5LIB=<as-needed> perl -MDevel::Cover=-coverage,none  -e 'print "$Devel::Cover::VERSION <--- HERE!\n"'