In shell programming if the path name encounters parentheses

In Linux, if the file name is enclosed in parentheses, the parentheses should be processed first, preceded by "\" before "(" and ")". Bracket_handle gives the processing method:
Sub Bracket_handle {
My ($tmp _name) = @_;
$tmp _name =~ s/\ (/\\\ (/g; # (
$tmp _name =~ s/\)/\\\)/g; #) = \)
return $tmp _name;
}

If the method is called:
My $modem _make_file_name = &bracket_handle ("$modem _make_file");

In shell programming if the path name encounters parentheses