Зависает скрипт на удалении симлинка

 ~ $ touch /tmp/foo
 ~ $ chmod 400 /tmp/foo
 ~ $ ls /tmp/foo
/tmp/foo
 ~ $ rm /tmp/foo
rm: remove write-protected regular empty file '/tmp/foo'? n
 ~ $ rm /tmp/foo < /dev/null
 ~ $ ls /tmp/foo
ls: cannot access '/tmp/foo': No such file or directory

$ alias | grep rm
$ 

static void
rm_option_init (struct rm_options *x)
{
  x->ignore_missing_files = false;
  x->interactive = RMI_SOMETIMES;
  x->one_file_system = false;
  x->remove_empty_directories = false;
  x->recursive = false;
  x->root_dev_ino = NULL;
  x->stdin_tty = isatty (STDIN_FILENO);
  x->verbose = false;

  /* Since this program exits immediately after calling 'rm', rm need not
     expend unnecessary effort to preserve the initial working directory.  */
  x->require_restore_cwd = false;
}

$ touch test1 test2 test3 test4
$ chmod 400 test*
$ rm ---presume-input-tty test* < /dev/null # this undocumented flag sets x->stdin_tty to 'true'
rm: remove write-protected regular empty file 'test1'? rm: remove write-protected regular empty file 'test2'? rm: remove write-protected regular empty file 'test3'? rm: remove write-protected regular empty file 'test4'?
$ ls test*
test1  test2  test3  test4
$ rm test*
rm: remove write-protected regular empty file 'test1'? n
rm: remove write-protected regular empty file 'test2'? n
rm: remove write-protected regular empty file 'test3'? n
rm: remove write-protected regular empty file 'test4'? n
$ rm -I test*
rm: remove 4 arguments? n
$ rm -i test* < /dev/null
rm: remove write-protected regular empty file 'test1'? rm: remove write-protected regular empty file 'test2'? rm: remove write-protected regular empty file 'test3'? rm: remove write-protected regular empty file 'test4'? 
$ rm test* < /dev/null
$ ls test*
ls: cannot access 'test*': No such file or directory