testing "printf handles %d bad_input" \
"${bb}printf '%d\n' 1 - 2 bad 3 123bad 4 2>&1; echo \$?" \
-"1\n""printf: -: invalid number\n""0\n"\
-"2\n""printf: bad: invalid number\n""0\n"\
-"3\n""printf: 123bad: invalid number\n""0\n"\
+"1\n""printf: invalid number '-'\n""0\n"\
+"2\n""printf: invalid number 'bad'\n""0\n"\
+"3\n""printf: invalid number '123bad'\n""0\n"\
"4\n""1\n" \
"" ""