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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 SUSE

usb_bulk_msg

USB_BULK_MSG(9) 						   USB Core APIs						   USB_BULK_MSG(9)

NAME

       usb_bulk_msg - Builds a bulk urb, sends it off and waits for completion

SYNOPSIS

       int usb_bulk_msg(struct usb_device * usb_dev, unsigned int pipe, void * data, int len, int * actual_length, int timeout);

ARGUMENTS

       usb_dev
	   pointer to the usb device to send the message to

       pipe
	   endpoint "pipe" to send the message to

       data
	   pointer to the data to send

       len
	   length in bytes of the data to send

       actual_length
	   pointer to a location to put the actual length transferred in bytes

       timeout
	   time in msecs to wait for the message to complete before timing out (if 0 the wait is forever)

CONTEXT

       !in_interrupt ()

DESCRIPTION

       This function sends a simple bulk message to a specified endpoint and waits for the message to complete, or timeout.

       If successful, it returns 0, otherwise a negative error number. The number of actual bytes transferred will be stored in the actual_length
       paramater.

       Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send
       a message from within interrupt context, use usb_submit_urb If a thread in your driver uses this call, make sure your disconnect method can
       wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request.

       Because there is no usb_interrupt_msg and no USBDEVFS_INTERRUPT ioctl, users are forced to abuse this routine by using it to submit URBs
       for interrupt endpoints. We will take the liberty of creating an interrupt URB (with the default interval) if the target is an interrupt
       endpoint.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010							   USB_BULK_MSG(9)
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