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61
votes
2answers
4k views

Clear / erase a mistyped invisible password on a shell / terminal in Linux

One thing that annoys me using Linux's terminal is when I have to type a invisble password, like when you run ssh. Sometimes I mistype one or more letters and then I have to press backspace key a few ...
20
votes
8answers
10k views

Disable Keyboard & Mouse input on unix (under X)

How can one programmatically "freeze" the Keyboard & Mouse temporarily, so that no one could mess with the system? There are several possibilities where this is useful. For instance, I have a ...
18
votes
2answers
15k views

Earphone remote in sound jack as X input

I have got new earphones, the AKG K318's to be exact and they have one of those remotes. On a smartphone, such as an Android phone or iPhone, the buttons map to actions on the music player such as ...
17
votes
1answer
8k views

SSH causes while loop to stop

I have finally managed to boil down a problem I have been struggling with for a few weeks. I use SSH with "authorized keys" to run commands remotely. All is fine except when I do it in a while loop. ...
16
votes
4answers
26k views

How to inject keystrokes via a shell script?

I'm trying to inject keystrokes into the input daemon so as to simulate typing from a Bash script. Is this possible, and if so, how can I make it happen?
16
votes
2answers
1k views

What does CTRL+4 (and CTRL+\) do in bash?

I just found out by accident that CTRL + 4 closes programs reading stdin input from the command-line. This is how it looks when I type CTRL + 4 or CTRL + / into programs reading stdin ryvnf:~$ ...
16
votes
2answers
4k views

bash script to detect and record mouse movements?

I need to be able to record the mouse movements every so often (every .2 of a second for example) and have them in a coordinate representation instead of a diff. I found the following script: ...
14
votes
1answer
1k views

Command line utility to retrieve password, that has no echo back

Bash builtin read command doesn't seem to support it, now I need to let user input a password while no echo should be displayed, what tool can I use?
13
votes
2answers
4k views

Record every keystroke and store in a file

I need to record every keystroke and store in a file in the user directory ~, when using my account, I am not sudoer and I cannot install programs (like logKeys) in any way. How could I do so using ...
13
votes
5answers
13k views

How to send keystrokes (F5) from terminal to a process?

I'm using an Raspberry Pi in combination with Chromium (kiosk mode) to show up some stats. The Pi doesn't have an connected keyboard so I searched for a solution to send keystrokes from the terminal ...
13
votes
2answers
14k views

How do mouse events work in linux?

This is mostly out of curiosity, I'm trying to understand how event handling works on a low level, so please don't reference me to a software that'll do it for me. If for example I want to write a ...
12
votes
2answers
16k views

How to debug the input from an input-device (/dev/input/event*)

I have a IR reciver that is using the imon-driver and i would like to get it working with the kernel. Right now half of the keys on the remote (image) works, but an all important think like the ...
9
votes
5answers
14k views

Why does “cat ttyUSB0” not produce output?

I connected an infrared receiver to a USB port ... (the last line of dmesg tells device file) $ dmesg [10496.596063] usb 7-2: new full-speed USB device number 2 using uhci_hcd [10496.751112] usb 7-2: ...
7
votes
1answer
983 views

Bash script doesn't read input

I have a script that is suppose to run a command in the background, and it does that. The problem is that when the script comes upon a read command, it doesn't pause and accept input. Here it is: ...
7
votes
1answer
295 views

X Server won't load when I add a 50-synaptics.conf file inside the xorg.conf.d directory

I'm using Fedora 18. I'm trying to configure my synaptics touchpad, I need the tapping and the horizontal scrolling inside Awesome Window Manager. I've created a file at ...
7
votes
2answers
2k views

Share keyboard over network as separate device?

I am trying to achieve something similar to this: http://superuser.com/questions/67659/linux-share-keyboard-over-network The difference is that I need the remote keyboard to be usable separate from ...
7
votes
1answer
895 views

barcode scanner input when running xorg and evdev

When I scan a barcode in a text console (CTRL+ALT+F1 or not running X) I get the correct input, but when I try with an application running on X, I don't get the correct barcode. The scanner is ...
6
votes
1answer
116 views

Extra output on input redirection

I have a folder with three files: $ ls a b c If I pipe the output of ls to wc, I get the right result: $ ls | wc -l 3 However, when I specify the input to wc as the output of ls, I get extra ...
6
votes
1answer
1k views

Dual head configuration with two touchscreens in Linux

As a part of my current project I need to set up a Linux-based workstation with two monitors, both of which are multitouch-enabled (ViewSonic VX2258wm, Quanta touch panel). So, naturally, I set up a ...
5
votes
2answers
787 views

Easy/simple input method package that works with minimal window manager?

I am trying out minimalist window managers such as, but not limited to, Xmonad, ScrotWM, ratpoison, etc. Since I occasionally need to enter Traditional Chinese characters, how do I install an input ...
5
votes
1answer
1k views

Fetching user input while running in the background

I am writing a script that prompts the user for input and does some processing afterwards. I was using read to get the data, but then I noticed that when the script is ran with a keyboard shortcut (I ...
5
votes
2answers
838 views

External tablet input devices for Linux (Inkscape/Gimp)?

What are good external tablet input devices for Linux? It should be used for more convenient use of Inkscape and Gimp. Some characteristics that are useful, I guess: connected via USB included pen ...
5
votes
1answer
2k views

Get raw input from command line (ignore shell meta characters)

Is there any way to read raw text from stdin before it is expanded or before the shell does anything to it? Say I wanted to run a script where a user enters a string which is then printed out, how can ...
5
votes
2answers
4k views

Capturing key input from events device and mapping it (toggle TouchPad key is unmapped)

I have a Lenovo IdeaPad Yoga 13 with Ubuntu 13.10 Installed. The device has a "Toggle TouchPad" button on the keyboard (F5). The keyboard's F* buttons are reversed (so to get F5, I need to press Fn + ...
5
votes
2answers
388 views

how to deal with keyboard-greedy apps

I'm having a very specific problem, however any help will aid in understanding X's relationship to the keyboard. I'd like to be able to launch the ElectricSheep program on top of music playing from ...
5
votes
1answer
754 views

How can I make C-m1 emulate a right click?

On Mac OS X, you can right click by holding down control and clicking. I swapped the command and control keys with setxkbmap -option altwin:ctrl_win, but how do I make it right click by holding down ...
5
votes
2answers
25 views

maintain prompt despite ouput flow

Short version Can I maintain an input symbol (> for instance) at the bottom of the terminal so that the user can input despite text flowing above? Long version I am making a multi-process ...
5
votes
1answer
1k views

How do I enforce system-wide custom keyboard shortcuts / macros?

I would like to be able to apply the same custom key bindings and shortcuts I use on my text editors to my entire desktop environment. I want to basically remap my keyboard system-wide, not just in ...
4
votes
4answers
748 views

Get input from editor (vim/nano/emacs/textmate?)

I was just curious if there's a way to get input not from StdIn but from $EDITOR - be it vim, nano, emacs or even a non-command-line-editor (MacVim/TextMate). What are the ...
4
votes
1answer
885 views

USB keypad (HID) not responding in linux but in grub

An external USB keypad I'd like to use gets recognised as a USB HID device, but it is not functional when Linux is booted. It does work when plugged into a Windows desktop and it does work while in ...
4
votes
1answer
65 views

Working around a buggy keyboard / hacking an input stream?

When I type the key sequence oun quickly, the key sequence oun<F12> is emitted by my keyboard. (Update: actually, you must press-and-hold each key in the sequence in order to trigger the ...
4
votes
1answer
506 views

Filtering the keyboard input

I have a program that takes input from the keyboard and presents a nice visualization. The purpose of the program is so that my infant can mash on the keyboard and get the computer to do something. ...
4
votes
1answer
596 views

“Merging” two input device drivers/nodes to one device node

Okay, I have two joysticks attached to my linux box and they show up as /dev/js0 and /dev/js1. My problem is, I have a third party application, (that I cannot change), that uses a joystick, and it can ...
4
votes
2answers
2k views

Multitouch support on KDE

On Ubuntu there is an app called ginn which forces non-multitouch aware apps to support multitouch. (source) Is there any analogue for the KDE Desktop Environment?
4
votes
0answers
288 views

How to get a Finepoint Digitizer Tablet to work under Fedora Core 16?

How to get a Finepoint Digitizer Tablet to work under Fedora Core 16? The hardware in question is a Gateway m285-E. It uses an active pen (has a battery in the pen). cat /dev/ttyS0 returns ...
4
votes
1answer
1k views

how to merge two audio input source using avconv

I try to make screencast using avconv and I facing a problem. I finally succeed to record both pc output and microphone input , the problem is that they're not merged in the output file. (I saw ...
3
votes
2answers
7k views

How to catch optioned and non optioned arguments correctly?

I want to write a shell script which will take some arguments with some options and print that arguments. Suppose the name of that script is abc.ksh. Usage of that script is - ./abc.ksh -[a ...
3
votes
1answer
253 views

Problem with getting interactive input in while read loop

I was doing something like the following minimal example: #! /bin/sh # $1 = file containing list of files to sync # $2 = source dir ; $3 = target dir cat "$1" | while read f do cp -i "$2"/"$f" ...
3
votes
1answer
445 views

How to lock-down input on a Linux machine?

We need to put out a web browser to a public place to show informations. I need to lock down all the input interfaces via software methods. So ex.: if someone plugs a USB keyboard to the machine it ...
3
votes
1answer
31 views

Head Script output explanation

So this shell script: #!/bin/bash head >/dev/null; head; almost always gives the same output when called with sequential numbers (e.g. seq 10000 | ./sscript) OUPUT: //blank line 1861 1862 ...
3
votes
2answers
275 views

Is there a way to execute commands while getting user input?

I’m fairly new to scripting and I have a high-level question of how to do something. I want to design a simple game similar to space invaders, with these two main features for now: Bullets drop ...
3
votes
1answer
1k views

send keystroke to process

I'd like to run some applications in fullscreen. Even though they don't have an explicit such option, it is possible with the metacity Alt-F11 command. So, I thought I could create such an input like ...
3
votes
1answer
2k views

Sending some input into a process, then resuming input from command line

I have an interactive terminal program, that accepts stdin (telnet for example). I want to send it some input before interacting with it, like this: echo "Hello" | telnet somewhere 123 But that ...
3
votes
1answer
32 views

How to always print the prompt on a new line & keep input

We all know this annoying issue: $ printf "abc" > some-file $ cat some-file abc$ which tends to mess up the prompt if it is any more complex than $, throws off the current cursor position and ...
3
votes
1answer
298 views

Connect a keyboard / IR controller to a command line program running in a screen

I'm trying to have my Raspberry Pi function as a GUIless music player. I've got Arch Linux installed, and use it through ssh. I've got also an IR receiver dongle, and I'm planning to use it to control ...
3
votes
0answers
40 views

How to obtain mouse events from the kernel when X is active?

When switching to a virtual terminal on my system, The kernel successfully delivers mouse events to a generic input event interface -/dev/input/event6 in my case- as well as legacy interfaces mouse1 ...
3
votes
0answers
182 views

Cannot use keyboard within Qt app without sudo

I have an embedded Qt application crosscompiled that runs on BeagleBone Black. It works Ok, but one thing- It doesnt accept keyboard input if i wont run in directly on BeagleBone Black preceeding with ...
3
votes
2answers
205 views

When does cat finish reading from a pipe?

Given the following code, why does cat only print the contents of the pipe after I've typed \n or CTRL+D? What are the conditions for cat to actually print what it read? #include <stdio.h> ...
3
votes
0answers
162 views

Ignore brief mouse click/releases

The switch contacts in my mouse are going, and rather than open it up yet again and clean them or try to hunt down a replacement switch (or buy a new mouse) I would like to solve this problem via ...
3
votes
0answers
421 views

How to know the event by looking at /dev/input/by-id

I want to access the keyboard device driver. I usually accesses it by looking at /dev/input/by-name but the event provided by it gets changed every time I log in. After searchin on the Net, I found ...