sh-script mode does not understand printf

[Peter Dyballa <Peter.Dyballa@Nols.de>]

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In GNU Emacs 21.1.1 (sparc-sun-solaris2.8, X toolkit, Xaw3d scroll bars)
 of 2001-12-02 on solaris
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.ISO8859-15@euro
  locale-coding-system: iso-latin-9
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

In Shell-script mode printf is not highlighted as part of shell syntax. 
Printf is a powerful successor to the various echo variants.


Recent input:
<next> C-x k <return> <home> > > > > > > f <next> C-x
k <return> <down> <down> <down> <down> <down> f <next>
C-x k <return> > > > > > > > <down> f <next> <next>
<next> <down> <down> <up> e <next> <next> <next> <next>
<next> <next> C-l <next> <down-mouse-1> <mouse-1> <next>
C-s e c h o <return> <next> <down-mouse-1> <mouse-1>
SPC " p r i n f " <left> <left> t <print> C-x d <return>
g B y <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> v q <up> v <home> <next> <home> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar>
<help-menu> <report-emacs-bug>

Recent messages:
Compiling /usr/local/share/emacs/21.1/lisp/progmodes/sh-script.el... 
(sh-canonicalize-shell)
Loading easy-mmode...done
Compiling /usr/local/share/emacs/21.1/lisp/progmodes/sh-script.el... 
(sh-mkword-regexpr)
Loading derived...done
Compiling /usr/local/share/emacs/21.1/lisp/progmodes/sh-script.el...done
Wrote /usr/local/share/emacs/21.1/lisp/progmodes/sh-script.elc
Byte-Compile: 1 file.
Type C-h for help, h for commands, q to quit. [2 times]
Mark set [2 times]
Loading emacsbug...done

-- 
Mit freundlichen Grüßen

Pete                                            Nols GES AG
                                                Gervinusstraße 18-22
(Peter Dyballa)         069-92024·795           60322 Frankfurt am Main