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Top Forums Shell Programming and Scripting Limit on number of pipes after long-running command? Post 303035200 by DevuanFan on Thursday 16th of May 2019 11:26:20 AM
Old 05-16-2019
No, that's not the issue: xinput test 6 definitely outputs to stdout. Proof is that xinput test 6 6>/dev/null produces output, but xinput test 6 1>/dev/null produces no output.

As I tried to explain, 6 in the command is an argument to xinput that tells it the input device I'm interested in testing. It is not a file descriptor.

Last edited by DevuanFan; 05-16-2019 at 12:31 PM..
 

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xinput(1)						      General Commands Manual							 xinput(1)

NAME
xinput - utility to configure and test X input devices SYNOPSIS
xinput [OPTIONS] [DEVICE] DESCRIPTION
xinput is a utility to list available input devices, query information about a device and change input device settings. OPTIONS
--version Test if the X Input extension is available and return the version number of the program and the version supported by the server. This option does not require a device name. --list [--short || --long] [device] If no argument is given list all the input devices. If an argument is given, show all the features of device. Uses XListInputDe- vices(3). If --long is provided, the output includes detailed information about the capabilities of each devices. Otherwise, or if --short is provided, only the device names and some minimal information is listed. --get-feedbacks device Display the feedbacks of device. --set-pointer device Switch device in core pointer. This option does nothing on X servers 1.5 and later. --set-mode device ABSOLUTE|RELATIVE Change the mode of device. --set-ptr-feedback device threshold num denom Change the acceleration of device. --set-integer-feedback device index value Change the value of an integer feedback of device. --set-button-map device map_button_1 [map_button_2 [...]] Change the button mapping of device. The buttons are specified in physical order (starting with button 1) and are mapped to the logical button provided. 0 disables a button. The default button mapping for a device is 1 2 3 4 5 6 etc. --query-state device Query the device state. --list-props device [device [...]] Lists properties that can be set for the given device(s). --set-int-prop device property format value Sets an integer property for the device. Appropriate values for format are 8, 16, or 32, depending on the property. Deprecated, use --set-prop instead. --set-float-prop device property value Sets a float property for the device. Deprecated, use --set-prop instead. --set-prop [--type=atom|float|int] [--format=8|16|32] device property value [...] Set the property to the given value(s). If not specified, the format and type of the property are left as-is. The arguments are interpreted according to the property type. --watch-props device Prints to standard out when property changes occur. --delete-prop device property Delete the property from the device. --test [-proximity] device Register all extended events from device and enter an endless loop displaying events received. If the -proximity is given, Proximi- tyIn and ProximityOut are registered. --test_xi2 Register for a number of XI2 events and display them. This option does not take a device argument. device 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. AUTHORS
Philip Langdale, <philipl@alumni.utexas.net> Frederic Lepied, France <Frederic.Lepied@sugix.frmug.org> Peter Hutterer <peter.hutterer@who-t.net> Julien Cristau <jcristau@debian.org> Thomas Jaeger <ThJaeger@gmail.com> and more. X Version 11 xinput 1.5.0 xinput(1)
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