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--- bash-4.2/redir.c	2015-04-27 23:03:55.663182162 +0200
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+++ bash-4.2/redir.c	2015-04-27 23:03:13.995181816 +0200
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@@ -63,6 +63,7 @@ int expanding_redir;
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 extern int posixly_correct;
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 extern int last_command_exit_value;
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+extern int executing_builtin;
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 extern REDIRECT *redirection_undo_list;
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 extern REDIRECT *exec_redirection_undo_list;
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@@ -307,11 +308,23 @@ write_here_string (fd, redirectee)
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      WORD_DESC *redirectee;
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 {
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   char *herestr;
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-  int herelen, n, e;
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+  int herelen, n, e, old;
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   expanding_redir = 1;
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+  /* Now that we've changed the variable search order to ignore the temp
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+     environment, see if we need to change the cached IFS values. */
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+  sv_ifs ("IFS");
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   herestr = expand_string_to_string (redirectee->word, 0);
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   expanding_redir = 0;
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+  /* Now we need to change the variable search order back to include the temp
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+     environment.  We force the temp environment search by forcing
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+     executing_builtin to 1.  This is what makes `read' get the right values
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+     for the IFS-related cached variables, for example. */
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+  old = executing_builtin;
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+  executing_builtin = 1;
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+  sv_ifs ("IFS");
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+  executing_builtin = old;
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+
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   herelen = STRLEN (herestr);
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   n = write (fd, herestr, herelen);