T=`mktemp -d "${TMPDIR:-/tmp}/sh-test.XXXXXXXX"` || exit
trap 'rm -rf "${T}"' 0
printf 'printf "this "\necho is a test\nexit\n\0' >"$T/testshellproc"
chmod 755 "$T/testshellproc"
PATH=$T:$PATH
[ "`testshellproc`" = "this is a test" ]