how can I run command line or shell script in Oracle

Please help me to create one text file to save all file names in directory
To put all filenames.dat into one file called datNames.txt I wrote a procedure as
create or replace
procedure host(cmd in varchar2 )
as
status number;
begin
dbms_pipe.pack_message( cmd );
status := dbms_pipe.send_message( 'HOST_PIPE' );
if ( status <> 0 ) then raise_application_error( -20001, 'Pipe error' );
end if;
end;
---------------------
I run the procedure in PL/SQL as
begin
  host('dir/b c:\dataloader\upload\*.dat > c:\dataloader\upload\datNames.txt');
end;
There is not error but it can not create c:\dataloader\upload\datNames.txt' eventhough I have granted write permission on the directory. But when I run it in MS DOs, It run OK.
Another question, I use 'dir/b c:\dataloader\upload\*.dat > c:\dataloader\upload\datNames.txt'  to run on window but if I want run  the procedure on Linux so Which shell script will be used to replace the MS DOS command line?
jujinAsked:
Who is Participating?
 
Mark GeerlingsConnect With a Mentor Database AdministratorCommented:
To put it simply: in SQL*Plus you *CAN* execute "host" commands directly, but in PL\SQL you *CANNOT* do that!  PL\SQL does not directly support "host" commands.  What you can do in PL\SQL though is call Java procedures, and Java can do "host" commands.  So, what you need to do is find (or write) a Java procedure to do the operating system tasks you want, then from PL\SQL you call the Java procedure.
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SujithData ArchitectCommented:
>> There is not error but it can not create
Do you have a supporting pro*C code that reads the pipe and execute the command?

>> Which shell script will be used to replace the MS DOS command line?
You should pass a different command to the procedure in Linux.
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jujinAuthor Commented:
hi sujith80
Not yet, I don't know how to support pro*C code to reads the pipe and execute the command. How can I do that?
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SujithData ArchitectCommented:
You should have a host language program(Pro*C or Java or ...) that reads the pipe and executes your command. DBMS_PIPE does "NOT" execute the commands.

See this link for a detailed example:
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_pipe.htm#CHDDFCFC
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SujithData ArchitectCommented:
Using dbms pipes also perfectly works to execute operating system commands. But DBMS_PIPE does NOT EXECUTE your commands. You have to write another program to read the pipe and execute the commands. This second program can be written in ANY host language that can read the pipe using DBMS_PIPE.
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