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Full Discussion: Limit on number of pipes after long-running command?
Top Forums Shell Programming and Scripting Limit on number of pipes after long-running command? Post 303035198 by DevuanFan on Thursday 16th of May 2019 11:14:57 AM
Old 05-16-2019
@vgersh99: X input devices have id's, which vary from machine to machine (on my machine, X sees the keyboard as input id=6 and mouse as input id=7, for instance).

Yes, the command you suggested gives the desired output when I type unix:
Code:
$ xinput test 6 | awk '/press/ {print $3}'
30
57
31
53

But it still leaves unanswered why we can only use one pipe after xinput test 6. For instance, this command produces no output when I type unix, although I'd expect grep to generate some ouput when u is pressed:
Code:
$ xinput test 6 | awk '/press/ {print $3}' | grep 30

What I'm trying to understand is why one pipe after xinput test 6 works fine, but two pipes never produce any output even when output is expected. That's the point of the thread.
Last edited by DevuanFan; 05-16-2019 at 12:20 PM..
 

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LEARN ABOUT X11R4

xinput

xinput(1)						      General Commands Manual							 xinput(1)

NAME

       xinput - utility to configure and test XInput devices

SYNOPSIS

       xinput  [version] [list [device_name]] [set-pointer device_name] [get-feedbacks device_name] [set-mode device_name ABSOLUTE|RELATIVE] [set-
       ptr-feedback device_name threshold num denom] [set-integer-feedback device_name index value] [set-button-map device_name map button 1  [map
       button 2 [...]]]  [query-state device_name] [test [-proximity] device_name]

DESCRIPTION

       xinput version
	       test if the XInput extension is available and return the version number of the program.

       xinput list [device_name]
	       If  no  argument  is  given list all the input devices showing all their features. If an argument is given, show all the feature of
	       device_name.  Uses XListInputDevices(3).

       xinput get-feedbacks device_name
	       Display the feedbacks of device_name. Uses XGetFeedbackControl(3).

       xinput set-pointer device_name
	       Switch device_name in core pointer. Uses XChangePointerDevice(3).

       xinput set-mode device_name ABSOLUTE|RELATIVE
	       Change the mode of device_name. Uses XSetDeviceMode(3).

       xinput set-ptr-feedback device_name threshold num denom
	       Change the acceleration of device_name. Uses XChangeFeedbackControl(3).

       xinput set-integer-feedback device_name index value
	       Change the value of an integer feedback of device_name. Uses XChangeFeedbackControl(3).

       xinput set-button-map device_name map button 1 [map button 2 [...]]
	       Change the button mapping of device_name. Uses XSetDeviceButtonMapping(3).

       xinput query-state device_name
	       Query the device state. Uses XQueryDeviceState(3).

       xinput list-props device_name [device_name...]
	       Lists properties that can be set for the given device(s).

       xinput set-int-prop device_name property format value
	       Sets an integer property for the device.  Appropriate values for format are 8, 16, or 32, depending on the property.

       xinput watch-props device_name
	       Prints to standard out when property changes occur.

       xinput delete-prop device_name property
	       Delete the property from the device.

       xinput test [-proximity] device_name
	       Register all extended events from device_name and enter an endless loop displaying events received. If  the  -proximity	is  given,
	       ProximityIn and ProximityOut are registered.

       device_name can be the device name as a string or the XID of the device.

       property can be the property as a string or the Atom value.

COPYRIGHT

       Copyright 1996,1997, Frederic Lepied.

       Copyright 2008, Philip Langdale.

AUTHOR

       Philip Langdale, <philipl@alumni.utexas.net>
       Frederic Lepied, France <Frederic.Lepied@sugix.frmug.org>

       Patches, bug reports, and suggestions are welcome.

Frederic Lepied 					   $Date: 1997/06/09 16:06:31 $ 						 xinput(1)
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