problema con parseo de fichero

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#1191

From: miguelblas
Date: Fri, 10 Mar 2006 10:49

20 lines
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Tengo un fichero con cadenas separadas por puntos, de distinta longitud
y distinto numero de campos, p.e. y sustituir el ultimo punto con un
"|" (como min. 3 campos)

entrada:
    aaaa.bbbb.cccc.dddd
    AAAA.BB.C.DDD
    1111.2222.33
    aaaaa.bbbb.cccc
    AAAA.BB.C.DDDDDD
salida:
    aaaa.bbbb.cccc|dddd
    AAAA.BB.C|DDD
    1111.2222|33
    aaaaa.bbbb|cccc
    AAAA.BB.C|DDDDDD

Existe algun comando (en ksh) para recoger esta salida (lo he intentado
sed pero no me sale) 
Gracias

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From: "miguelblas" <miguelblas@terra.es>
Newsgroups: es.comp.os.linux.programacion
Subject: problema con parseo de fichero
Date: 10 Mar 2006 02:49:14 -0800
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