If you are getting link a new debit or credit card to make an instant payment error or we couldn't complete your purchase using card MasterCard error while paying through paypal by using Debit Card means actually there is Problem with card or You are Paying in Wrong Currency means order in Dollar you are paying...
Tuesday, 24 December 2013
Friday, 20 December 2013
Solution to change Network device Name (eth0) in CentOS, Fedora Linux
Open the /etc/udeve/rules.d/70-persistent-net.rules and change NAME as your require.
cat /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule...
Tuesday, 17 December 2013
Rocks Cluster : untrusted X11 Warning Message when SSH X11 compute Nodes
When we login ssh with X11 from rocks master node to computer node it doesn't allow X11 to forward as :
$ ssh node10 -X
Warning: untrusted X11 forwarding setup failed: xauth key data not generated
Warning: No xauth data; using fake authentication data for X11 forwarding.
Last login: Tue Dec 17 20:34:52 2013 from test.rocks.com
Rocks...
Monday, 16 December 2013
Installation of GCC 4.8.2 compilers on CentOS 6 x86_64
Before Installing GCC 4.8.2 get packages and pre-requisties :
GCC 4.8.2 http://mirrors.ispros.com.bd/gnu/gcc/gcc-4.8.2/gcc-4.8.2.tar.bz2
Pre-requesties :
MPC http://www.multiprecision.org/mpc/download/mpc-1.0.1.tar.gz
MPFR http://www.mpfr.org/mpfr-current/mpfr-3.1.2.tar.bz2
GMP https://gmplib.org/download/gmp/gmp-5.1.3.tar.bz2
ISL ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/infrastructure/isl-0.11.1.tar.bz2
CLOOG ftp://ftp.irisa.fr/pub/mirrors/gcc.gnu.org/gcc/infrastructure/cloog-0.18.0.tar.gz
Install...
Friday, 20 September 2013
Service modules_dep in Linux Enable or Disable
Service modules_dep in Linux Enable or Disable - Enable it
It is one-time bootup script, not a daemon. So it does not consume resources after bootup. You can browse its source code at /etc/init.d/modules_dep
It's a small script that fixes module.dep for iptabl...
Saslauthd Linux Service enable or disable
Saslauthd Linux Service disable or enable is depend on your postfix
saslauthd is a daemon process that handles plaintext authentication requests on behalf of the SASL library
Postfix for SMTP Authentication using SASL for this saslauthd necessary
so if you are running postfix then enable Saslauthd service otherwise disable...
Thursday, 5 September 2013
Solution : DBus error org.gtk.Private.RemoteVolumeMonitor.Failed:An operation is already pending
If you get Unable to mount usb drives and getting DBus error org.gtk.Private.RemoteVolumeMonitor.Failed:An operation is already pending like below
Solution is Do as root
[root@sys ~]# cd /media/
[root@sys media]# ls -a
. .....
Wednesday, 4 September 2013
Which services should be disabled in Linux
To enhance performance you can disable some services in Linux system check below information to disable unimportant services
-----------------------------------------------------------------
NetworkManager 0:off 1:off 2:on 3:on 4:on 5:on 6:off
You can do...
Saturday, 31 August 2013
How to prevent accidental delete rm -rf * in Linux
To prevent accidental delete rm -rf * in Linux by different ways
If you want to prevent any important directory deleted accidental
Create a file named -i in that directory. How can such a odd file be created? Using touch -- -i or touch ./-i
Now try rm -rf *:
[root@server]# touch {1..4}
[root@server]# touch -- -i
[root@server]#...
Thursday, 29 August 2013
Solution : Check Variable in Linux Bash is Float or Interger
Hi,
Here solution for checking a variable in Linux Bash is Float or Integer by using grep.
---- file : test.sh
function check_int(){
echo $1 | grep "^[0-9]*$" > /dev/null
if [ $? -ne 0 ]; then
echo $2 : $1 is not a number;
else
...
Wednesday, 28 August 2013
Create Fake Swap in OpenVZ VPS if you get swapon failed: Operation not permitted Error
if you get swapon failed: Operation not permitted Error even if you run as root it is because in your VPS swap creation is not allowed
follow below steps to Create Fake Swap in OpenVZ VPS
[root@server] free -m
total used free
Mem: ...
How to Copy with overwrite in Linux
To copy content with default overwrite in linux use below command
[root@server1] yes | cp -rf directory1/* /home/director...
How to restrict download speed in wget
To restrict download speed in wget use below command
wget http://wordpress.org/latest.zip --limit-rate=500k
where --limit-rate=500k speed
...
How to Enable .htaccess and Verify if .htaccess file is running
Step 1 : changes in the .htaccess should take effects if you change .conf file of apache like below
<Directory ..>
...
AllowOverride None
...
</Directory>
Should be changed to
<Directory ..>
...
AllowOverride All
...
</Directory>
Step...
Solution: Install/Update Wordpress plugins without providing FTP access
Hi if you don't have FTP access to your wordpress server yow follow below steps to Install/Update Wordpress plugins from wordpress admin panel
step1 : Change "wp-content" folder permissions to 777
sudo chmod -R 777 wp-content
step2 : In "wp-config.php" file add define('FS_METHOD', 'direct');
example :
......
......
/**...
Wednesday, 21 August 2013
Solution : Making of Bootable USB live from Open Suse 12.3 ISO
Hai,
Here is the solution for the opensuse bootable usb live.
Download the Opensuse 12.3 from :
http://mirror1.hs-esslingen.de/pub/Mirrors/ftp.opensuse.org/distribution/12.3/iso/openSUSE-12.3-GNOME-Live-i686.iso
Now login as root in any linux machine
$ cd < location of folder of iso>
$ isohybrid...
Tuesday, 20 August 2013
Solution : SQUID PROXY - NCSA AUTHENCIATION PROBLEM
SQUID PROXY SERVER CONFIG FILE:
sample /etc/squid3/squid.conf :
-------------------------------
auth_param basic program /usr/lib/squid3/ncsa_auth /etc/squid3/passwd
auth_param basic children 5
auth_param basic realm Squid proxy with NCSA
auth_param basic credentialsttl 2 hours
auth_param basic casesensitive off
acl...
Wednesday, 14 August 2013
PUTTY command line ssh login with plink
First we need Putty in Linux ?
Download the PUTTY source code file from :
http://the.earth.li/~sgtatham/putty/latest/putty-0.63.tar.gz
After that we need build that package. we need gcc and gcc-devel packages, if you want gui we need gtk-2 packages
$ tar...
Sunday, 4 August 2013
Solution : javac command not found in Linux
Hi if you get javac command not found in Linux even you have
java-open jdk installed means java-devel not there
Install java-devel
In Fedora
yum install java-devel
In Ubuntu
apt-get install java-dev...
Steps to Sign a JAR file using self signed Certificate
To Sign a JAR file using self signed Certificate follow below steps
keytool come with Java, so install Java First
Step1 : Create .jar file from .class file
C:\javaapp> jar cvf VideoANTyd.jar VideoANTyd.class
Step2 : Create a Key by using key tool
C:\javaapp>keytool -genkey -alias selfsigned -keyalg RSA -keysize...
Thursday, 1 August 2013
Simple and Best Linked List example in C
Hi,
Below linked list example is taken from http://www.macs.hw.ac.uk/~rjp/Coursewww/Cwww/linklist.html it is easy and working properly. I did small modifications to it
This example is single linked list
#include<stdlib.h>
#include<stdio.h>
struct list {
int val;
struct list *...
Solution : Implicit Declaration Of Function malloc error in Linux Kernel
Hi if you get Implicit Declaration Of Function malloc error in Linux Kernel then
solution is use vmalloc or kmalloc
kmalloc: Best used for fast allocations that are smaller than a page (PAGE_SIZE, 0x1000 on most architectures). It doesn't involve mapping memory, so you get the memory straight from the kernel's 1:1 physical...
Tuesday, 30 July 2013
Solution: Bind Failed Permission Denied error in Linux
if you get Bind Failed Permission Denied error in Linux
for different application like "iperf" etc
Solution is : Disable SeLinux
Below steps show how to disable SELINUX
To test SeLinux is running or not
[root@center /]# selinuxenabled && echo enabled || echo disabled
enabled
So SELINUX is Enabled
To stop...
Monday, 29 July 2013
How to Find File Location in Linux
This post explains How to Find File Location in Linux
Find file in home directory
[root@sys ~]# find /home -name "finename.txt"
Find file in entire system
[root@sys ~]# find / -name "filename.txt"
Find file containing perticular word example httpd
[root@sys ~]# find /etc -name "*httpd*"
Find files of...
Unable to Login as root authentication failure error in Linux
If you get Unable to Login as root authentication failure error in Linux
Modify two files
1. vi /etc/pam.d/gdm-password
in this file put comment on line "auth required pam_succeed_if.so user != root quiet" like below
auth [success=done ignore=ignore...
Thursday, 25 July 2013
Steps to Compile Linux Kernel with Different Configuration Options
Below Steps describe How to Compile Linux Kernel with Different Configuration Options
1. Download Kernel from https://www.kernel.org/
download tar.xz file Example:https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.10.3.tar.xz
2. Extract tar.xz file
tar -xvf linux-3.10.3.tar.xz
3. Goto Extracted folder
cd linux-3.10.3
4....
Wednesday, 3 July 2013
Upgrade Fedora 18 to Fedora 19
Fedora 19 (release 03 July 2013) :
First we need fedup software to update the fedora 18 to fedora 19
1) install fedup software by yum
# yum -y install fedup
2) Now it time to start the update, before that close all applications ( because it reboot after downloading the packages ). Using...
Friday, 26 April 2013
Solution : PHP Warning: mysql_connect(): No such file or directory
If you get PHP Warning: mysql_connect(): No such file or directory and unable to connect mysql through php then change localhost to 127.0.0.1 while connecting to database
example:
$connection = mysql_connect('localhost', 'root', 'password');
to
$connection = mysql_connect('127.0.0.1', 'root', 'password'...
Wednesday, 10 April 2013
Solution : The mysqli extension is missing. Please check your PHP configuration
if you get The mysqli extension is missing. Please check your PHP configuration error in phpmyadmin
follow two steps
1. install php-mysql
in redhat , fedora
yum install php-mysql
in ubuntu
apt-get install php-mysql
2. restart apache server
restart mys...
Tuesday, 9 April 2013
Steps to Install Python3 in Linux through Command Line
To Install Python3 in linux through Command line follow below commands
Dependencies for Python3 is gcc and some times zlib-devel so install these first
in redhat ( RHEL ), fedora etc
commands are
root@bt:~# yum install gcc
root@bt:~# yum install zlib-devel
in Ubuntu, Linux Mint etc
commands are
root@bt:~# apt-get install gcc
root@bt:~#...
Saturday, 6 April 2013
Solution: Unable to access mysql server of Amazon ec2 instance remotely
If you have problem in accessing mysql server server publicly or remote even in the security group if you open mysql port 3306 in inbound rules. to solve this problem simply stop iptables.
First check port 3306 whether it is Listining or not
[root@ip-10-142-194-252 ~]# netstat -ant
Active Internet connections...
Solution: Unable to access httpd server on Amazon ec2 instance
If you have problem in accessing http server publicly even in the security group if you open http port 80 in inbound rules. to solve this problem simply stop iptables.
First check port 80 whether it is Listining or not
[root@ip-10-142-194-252 ~]# netstat -ant
Active Internet connections (servers and established)
Proto...
Saturday, 30 March 2013
Solution: PHP setcookie Warning: Cannot modify header information - headers already sent
Solution: PHP setcookie Warning: Cannot modify header information - headers already sent to avoid this problem add ob_start() at beginning of php and add ob_end_flush() at end of php code like below
<?php
ob_start(); // Initiate the output buffer
//your code
ob_end_flush(); // Flush...
Wednesday, 27 March 2013
How to Flush route table in Linux
To remove or Flush all entries in route table the command used is
root@system1:~# ip route flush table main
Run Above command as ro...
Friday, 22 March 2013
PHP Replace new lines, tabs and multiple spaces with single space
preg_replace('/\\s+/', ' ',$data) used to Replace new lines, tabs and multiple spaces with single space in PHP
example:
<?php
$data = 'Hi tab i am
new line more spaces';
$data= preg_replace('/\\s+/', ' ',$data);
echo $data;
?>
Output:
Hi...
Monday, 18 March 2013
Upgrade Cent OS from any version to Any version
To Upgrade CentOS the common command used is yum update. This is used to Upgrade Cent OS from any version to Any version.
command:
As a Root
root@system1# yum upda...
Find the size of folders in linux
Finding the size of a directory and finding the amount of free disk space that exists on your machine. The command you would use to find the directory size is ' du '. And to find the free disk space you could use ' df '.
$ du
Gives you a list of directories that exist in the current directory along with their sizes. The last...
XOR of Hexadecimals in C program Example
To do XOR in in C the operator used is "^"
#include<stdio.h>
int main()
{
int x;
int y;
int res;
printf("\n Please enter the value for first number in hex format:");
scanf("%x",&x); //reading hexadecimal value
printf("\n Please enter the value for second number in hex format:");
scanf("%x",&y);
res=x^y;
printf("\n...
Solution: Access Variables in Different C files
To access variables in different C files, check below example
header.h
extern int a;
file1.c
#include</root/path/header.h>
int a;
a = 20;
file2.c
#include</root/path/header.h>
printf("a value is %d",a);
Note: if you compile individual file and check then you may get error
Compile like:
gcc file1.c file2.c...
Solution: warning: ISO C90 forbids mixed declarations and code
If you get above warning means in your code operation code in between deceleration see below example
Invalid Code:
main(){
int a;
a = function1();
int b;
b = function2();
}
Valid Code:
main(){
int a;
int b;
a = function1();
b = function2();
}
So write all declarations one pla...
Tuesday, 12 March 2013
Set Up SCTP in Linux From SCTP Module
Fedora has SCTP kernel as the kernel module, kernel recompile is not needed for our case. Instead, the SCTP kernel module is simply needed to be loaded into the RAM memory on the Fedora with the command ‘modprobe’. The command ‘modprobe SCTP’ plays...
Sunday, 10 March 2013
Jquery Mobile header footer moving problem while click
This post will show how to avoid header, footer moving up and down while clicking
to avoid this problem add data-tap-toggle="false" at header and footer
example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>App</title>
<meta content="width=device-width, minimum-scale=1,...
Thursday, 7 March 2013
Upgrade Backtrack 5 R2 to R3
To upgrade Backtrack 5 R2 to R3 follow below steps
System@bt# sudo apt-get update && apt-get dist-upgrade
For 32 bit Systems
System@bt# apt-get install libcrafter blueranger dbd inundator intersect mercury cutycapt trixd00r artemisa rifiuti2 netgear-telnetenable jboss-autopwn deblaze sakis3g voiphoney apache-users...
Solution : Backtrack 5 apt-get upgrade error var/lib/dpkg/info/w3af.postins
If you ger below error ,simply download missing file to /tmp folder
system@bt:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
smartphone-pentest-framework
0 upgraded, 0 newly installed, 0...
Solution : dpkg: warning: parsing file 'magic tree':error in Version string 'r1643-bt0': version number does not start with digit
If you get error like below Simple remove packages which are causing error
dpkg: warning: parsing file '/var/lib/dpkg/status' near line 5812 package 'magictree':
error...
Solution : Error while processing magictree_r1802-bt0_all.deb Sub-process /usr/bin/dpkg returned an error code (1)
If you get Error Like Below
Errors were encountered while processing:
/var/cache/apt/archives/magictree_r1802-bt0_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Simply delete the file which causing Error
system1# rm -rf /var/cache/apt/archives/magictree_r1802-bt0_all.de...
Add HTTP Proxy to SVN - Subversion
Below Instructions show how to setup proxy for SVN -Subversion
system1# cd ~/.subversion
system1# ls
auth config README.txt servers
Edit servers file
system1# gedit servers
Add Below Lines to servers file
[global]
http-proxy-host = your_ipaddress
http-proxy-port = 3128
http-proxy-compression...
Tuesday, 19 February 2013
Update table row in MySQL
The DQL Syntax to update row in MySQL was
UPDATE table_name SET column1=value, column2=value2 WHERE some_column=some_valu...
Python read all rows of MySQL table
Below python code print all first column values of table in MySQL
query="SELECT * from table_name"
cursor.execute(query)
row = cursor.fetchone()
while row is not None:
print(row[1])
row = cursor.fetchone(...
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