I want to write a driver in c so that when i released the key some message will printed in output screen. The driver should be for arm.I have a driver which read the key when it is pressed.But i want the both (means key press and release).
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I have a problem when using awk:
e.g: awk '{processing text}' File1 > File2
But when I'm processing the File1, I want to print out some messages to the screen (not the File2). How can I do that?
Now we are implementing our own shell using C++. What upseting us is the history command function, we use an array to store the history commands, and print the when receiving the up and down arrow buttons. The problem is we cannot modify the history command already printed on the terminal, we even cannot move the cursur, let alone modifying the command.
I'm writing output of top command to a file However since top does not provide time I would like to append the 'date' command and then write all this to a file.
so something like top -d 1 -b; echo 'date' >>file
is it possible to log the command output's history that are previously printed messages in the terminal to a file? that is the first command output when i first opened terminal through the last command.
View 5 Replies View Relatedlike my alias a retired person, and Its never to late to learn something½ve just installed Ubuntu and found a tutorial online about bash-script.Manage some, but I cant to this one:[Write a script that makes file executable and writes a message that it has been done.If I run the command > <scriptName> <fileName> , then the file fileName should be executable and then it should indicate that fileName have been executable.]
Ive read man pages up-n-down and search the web, and I think I should let the script use chmod and ls -l, but I cant get the hole picture here. Actually I have nothing to show up, so I hope someone could help me with some ideas or a soloution - just to the how it should look.This is my first post, ever, at a forum like this, so please be nice if I didnt follow any rules here, I dont know if you even will answer this post, but at least give me some clues, a skeleton-code ti be based on
I cant seem to install Ubuntu 9.10 at all. At 15% I get the following Error Message Input/output Error During Read On/dev/sda then I get the creation of swapspace in partition #5 of SCSI1(0,0,0) (SDA) Failed. Ive tried 6 times already. Im getting no sound at all. How can I change the screen resolution. 800 x 600 is the highest it will go. Im getting really discouraged with Ubuntu. Alot of people seem to have the same problems I am having but there is no solutions. I've checked the MEMTEST and passed, done a disk check and passed.
View 9 Replies View RelatedI just wanted to let everyone know that the latest 11.6 Catalyst driver has been released.I would like everyone to know that I have successfully installed the ATI drivers in gnome, but lost the usability of gnome-shell and automatically dropped back to the basic Gnome desktop. But I still have a usable system.
View 1 Replies View RelatedYou can get the 64 bit version 270.41.19 of the nVIDIA proprietary Video Driver from this link:[URL]..
And the new video driver from nVIDIA no longer is outputting any error message when it is installed as was the case with 270.41.6. So, it is worth a try I do believe to go with the new version. I have a bash script that can be helpful in installing this driver if you would like to use it. Read about lnvhw from here: LNVHW - Load NVIDIA (driver the) Hard Way from runlevel 3
I want to learn to write an USB driver on linux 2.6.x I tried to find some documents but i could not find documents for it . Most of it gave direct driver code as reference.
View 1 Replies View RelatedI know, I know..."How long is a piece of string"?
I have one of these devices:
[URL]
Of course, it's Windows only, and XP only at that. However, the data that needs transferred between the device and the computer should be fairly basic, unless it offloads a lot of processing to the computer. I'm not a programmer, nor do I play one on TV, but I have written some fairly complicated microcontroller programs and some basic Java GUIs. Besides writing the actual code, how hard is it to do whatever needs done to make a Linux device driver, apart from the code to make the device work?
The code below prints garbage if I use puts() but it is fine if I use printf() instead (see sample of output at the bottom of this post). The odd thing is that the mess always starts after exactly eight properly printed characters. That sort of regularity can't be a coincidence, can it? It almost looks like an encoding issue (I'm using UTF-8) but if it really is, then I don't understand why the printf() is unaffected.
Code:
#include <stdio.h>
#include <string.h>
const char *nChars (const char *, int);
int main (int argc, char * argv[]){
char * name ="Count Dracula++";
int len = strlen(name);
if (argv[1] == 0) argv[1]="printf";
printf("--->%d characters", len); .....
I did searched you tube but my results were not great.I have 2 books on KernelProgramming.I feel I need if some where I can get a video tutorial which can help me to understand how to develop a Linux Device driver that will be great.I had a look at Greg Kroah Hartmans video lecture of developing patches on ......I have been reading books and a lot of stuff.So I wish if I could get a video lecture that would be better
View 1 Replies View RelatedTo redirect standard output to multiple files:
Code:
echo Test | tee file1 file2
My problem is that the word "Test" still displays to the screen? I want same effect as:
Code:
echo Test > file1
but with multiple file redirection.
I am building a midi synthesizer that I'd like to be able to control from linux. I know its a rather broad question, but, how do I go about this? At this point the hardware consists of a simple UART bridge, and I've already written a simple C++ program using termios to send the raw midi data to the device. Obviously I don't want to write a player/sequencer from scratch, so where should I start if I wanted to get this thing to work with, say, a sequencer like rosegarden? Do I write the driver for rosegarden, or hook into alsa or what?
View 1 Replies View RelatedIts my first post in here so please be patient I am trying to use regex in perl script to detect allowed words from the file and then print output to the screen.
As an example : I have text file with orders and returns :
Item2-SKU-2-11.08.2010-online
Item3-SKU-3-11.09.2010-return
Item4-SKU-4-11.09.2010-store
My question: is it possible to make sure that i am ony outputing to the screen orders based on few conditions like Item,order form e.g. online.And is it possible to have multiple matches (Item2 only diplay if ordered online etc)
I have a very basic program which I wrote, to print the integer equivalents of an ASCII character. The code is below:
Code:
#include<stdio.h>
int main(void)
{
char c;
[code]....
The code is supposed to take a character as input and print the integer equivalent of that character. But the problem is that, after printing the integer equivalent, it prints an extra '10', every time.
Code:
f
102
10
[code].....
Why does this extra '10' always come? When the code is just a simple:
Code:
#include<stdio.h>
int main(void)
{
[code]....
The code works just fine. There is no extra '10' displayed. I am using Ubuntu 9.10 with gcc-4.4.1.
I've been getting an error message at login that .ICEauthority cant be written to. If I look with nautilus permissions it shows owner is root with read and write permissions -rw------- 1 root root 13430 2010-11-21 18:40 .ICEauthority. Should this file be owned by root or the user ?
View 9 Replies View RelatedHow do i write ping output to txt file?
View 3 Replies View RelatedMy provider sometimes kicks me and assigns a new IP address.I'd like to write a little script which displays a message when I fall offline. What is the most reliable way to check whether I'm offline with a (bash?) script?
View 2 Replies View RelatedI'm trying to install ubuntu 10.04 on my desktop. I would like to erase my old xp completely and have only ubuntu as my OS. I boot from cd but when I install it stops at 15% and keeps giving me this error:
Input/output error during write on /dev/sda.
It won't let me retry or ignore and when I cancel the installation continues until I get another error.
When I run dmesg I get
Code:
[drm:drm_mode_rmfb] *ERROR* tried to remove a fb that we didn't own
Does anyone have any idea what that means?
Fedora 12 Gnome 2.28
When inserting/removing a usb device to a board based on linux system, an output is given:
Code:
# mmc1: card 0001 removed
mmc1: new SD card at address 0001
[code]...
I'm not sure about the following behavior so thought I would put it out to see if there is an error I need to resolve, or simply a process that I need explained.I'm also not sure if this is an Ubuntu issue, a Linux issue, or other... but here goes.I ran my "make build" in two different ways; one with just "make build" and one with "make build > output" (so I could review the full script).With just "make build" the process finished and returned to the command prompt.
With "make build > output", after the process had finished (script in output document identical to what was in the terminal with "make build") a new set of data was displayed in the terminal (see below).With the other examples of using "make build > output" the times it would parse something back to the terminal window was when there was an error. As I fixed the errors these breaks back to the terminal window would stop. So I'm wondering if this indicates a new error, but because the "make build" now completes successfully (at least it appears to), I'm wondering if this data in the terminal window is just a behavior related to redirecting the output script using the ">" process and something to do with returning to the terminal once a process completes
We are trying to create a message forwarder program that receive a message on Port A and pass it on t Port B. Also receive a message from Port C and Pass it on to Port D as follows.
[Code]...
I've been trying out qemu to play around with some VMs. It's working well but I keep wanting to be able to view the text (linux boot process) that quickly scrolls by in the qemu window on startup of my linux virtual machine. Is there any way to retrieve this via qemu?
View 1 Replies View RelatedI want to write expdp output in a text file using a shell script
If i write like below:
It will write whatever is there in log file to text file
But, sometimes export fails with out start taking export (without generating log file) because of job already exists error. such times, we dont know about that error until we check manually... so i wrote like below:
But still it is not writing anything in to text file using above stmt...
I go and restart ssh and I get this weird message. thought I should be getting ok or fail message, at least thats how I remember it. What do you think?nate@universal-mechanism:~$ sudo service ssh restart
View 3 Replies View RelatedWhen I try to upgrade, I always get this message: "E: /var/cache/apt/archives/linux-image-2.6.32-5-amd64_2.6.32-35_i386.deb: failed in write on buffer copy for backend dpkg-deb during `./lib/modules/2.6.32-5-amd64/kernel/drivers/net/s2io.ko'"
View 14 Replies View RelatedI am trying to write a script to access sqlplus and use the output to replace the result in another file. But I am having some issues with it (This script is just a test script and I am just trying to print the updated value.
#!/bin/bash
a=`echo exit|sqlplus -S -L xxx/xxx@xxx @test.sql`
bb=$a
[code].....
