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   Fix  memory  leak  related  to  aliasrun().  Precmd,  Cwdcmd etc. leak
   memory.
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   Fix migrate -site $$... Seems to hang... (aix370)
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   Fix history in loops.
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   New idea: sed operations on variables.

   Lots  of  people  seem  to  like  the  idea  to be able to do sed type
   operations  on  shell variables. Maybe we can extend the syntax of the
   variable  editing  to understand string operations. So I would like to
   be able to use:

    > set a="this is a STRING"
    > echo $a:[3-]
    is is a STRING
    > echo $a:[#]
    16
    > echo $a:[6-7]
    is
    > echo $a:[-2]
    ng
    > echo $a:[-20]
    Subscript out of bounds.
    > echo $a:[2-20]
    Subscript out of bounds.
    > echo $a:[1-1]:u$a:[2-].
    This is a string.
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   Fix pipelines that contain builtins so that they behave correctly.

   I  tried  to  fix  that (most of the code is in sh.sem.c, but it works
   only  for  non  POSIX  machines  cause otherwise the setpgid() I added
   fails).
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   Fix the correct code... How to do that involves A.I....
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   Rewrite  the  whole  thing.  It  has  taken  to  much beating over the
   years...
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   Add  another  hook  like  precmd  to  be executed after the prompt but
   before the command.
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   Add instructions for using configure in the README file.
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