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Full Discussion: How to send data to previous program (pipe)?
Top Forums Shell Programming and Scripting How to send data to previous program (pipe)? Post 303013075 by rbatte1 on Wednesday 14th of February 2018 12:25:32 PM
Old 02-14-2018
I've been away from this thread for a while.

Would it be possible to have this sort of command still cmd1 | cmd2 but have the sqlplus in cmd2? The cmd1 would need to be reading a file or pipe that cmd2 writes to.

An alternative might be something like cmd1 < <(cmd2) and this time the sqlplus is in cmd1. This is a bash way rather than ksh.

Can you tell us more about the output that the sqlplus will create and how/why it must then take in new input depending what it throws out? It might be better to set it up as a set of separate calls, i.e.
  • script calls sqlplus call to generate some output into work-file1 and then exit
  • script reads work-file1 and calls sqlplus with appropriate input, writing work-file2
  • script reads work-file2 and calls sqlplus with appropriate input, writing work-file3
.... and so on until you have the desired output.

Does anyone care to shoot me down to say that these are all bad approaches? I'd be happy to illustrate how not to do it if that's useful to the thread.


I'm just a bit lost about why the sqlplus needs to have input based on it's output. Have I missed the point?


Robin
 

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LEARN ABOUT DEBIAN

pvm_setsbuf

SETSBUF(3PVM)							  PVM Version 3.4						     SETSBUF(3PVM)

NAME

       pvm_setsbuf - Switches the active send buffer.

SYNOPSIS

       C    int oldbuf = pvm_setsbuf( int bufid )

       Fortran	 call pvmfsetsbuf( bufid, oldbuf )

PARAMETERS

       bufid   Integer the message buffer identifier for the new active send buffer.  A value of 0 indicates the default receive buffer.

       oldbuf  Integer returning the message buffer identifier for the previous active send buffer.

DESCRIPTION

       The  routine  pvm_setsbuf  switches the active send buffer to bufid and saves the previous active send buffer oldbuf.  If bufid is set to 0
       then the present active send buffer is saved and no active send buffer exists.

       The routine is required when managing multiple message buffers.	For example switching back and forth  between  two  buffers.   One  buffer
       could be used to send information to a graphical interface while a second buffer could be used send data to other tasks in the application.

EXAMPLES

       C:
	    sbuf1 = pvm_setsbuf( sbuf2 );
       Fortran:
	    CALL PVMFSETSBUF( NEWBUF, OLDBUF )

ERRORS

       These error conditions can be returned by pvm_setsbuf

       PvmBadParam
	      giving an invalid bufid.

       PvmNoSuchBuf
	      switching to a non-existent message buffer.

SEE ALSO

       pvm_setrbuf(3PVM)

								  30 August, 1993						     SETSBUF(3PVM)
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