Notes by Dr. Xi
Displaying keyword search results 1 - 10
Created by Dr. Xi on February 13, 2013 19:40:08
Last update: February 13, 2013 19:40:08
According to MSDN : On Windows 7 and on Windows Server 2008 R2 with the Wireless LAN Service installed, the operating system installs a virtual device if a Hosted Network capable wireless adapter is present on the machine. This virtual device normally shows up in the "Network Connections Folder" as "Wireless Network Connection 2" with a Device Name of "Microsoft Virtual WiFi Miniport adapter" if the computer has a single wireless network adapter. This virtual device is used exclusively for performing software access point (SoftAP) connections. The lifetime of this virtual device is tied to the physical wireless adapter. If the physical wireless adapter is disabled, this virtual device will be removed as well. On Windows 7, there's no UI to start or stop SoftAP....
Created by Dr. Xi on August 15, 2012 12:05:39
Last update: August 15, 2012 12:05:39
Use OpenSSL's s_client command to fetch a page manually:
$ openssl s_client -connect localhost:443 -state -...
Sample session for Google:
$ openssl s_client -connect www.google.com:443 -st...
Resource: SSL/TLS Strong Encryption: FAQ
Created by Dr. Xi on May 25, 2012 15:47:34
Last update: May 25, 2012 15:49:33
Steps to configure SSL for Apache HTTPD server on Windows:
In Apache2.2/conf/httpd.conf , load mod_ssl and include httpd-ssl.conf :
LoadModule ssl_module modules/mod_ssl.so
...
In Apache2.2/conf/extra/httpd-ssl.conf , make sure the paths for the cert files point to the cert and key you want to use:
# Server Certificate:
# Point SSLCertificat...
Start up Apache. If it fails, use the command line to see what the error is. There won't be any log in error.log if there are errors in the conf files:
C:\Program Files (x86)\Apache Software Foundation\...
I corrected the previous error by using the alternative line for SSLSessionCache :
# Inter-Process Session Cache:
# Configure ...
Created by Dr. Xi on February 06, 2012 12:14:11
Last update: February 07, 2012 15:39:35
Oracle sqlplus command line tools does not support command line editing out-of-the-box. But on Linux there's a handy utility that enables command line editing with any command line tool: rlwrap - readline wrapper.
Install rlwrap:
$ sudo apt-get install rlwrap
Create a keywords file .sql.dict (optional, but convenient):
false null true
access add as asc begin by chec...
It would be nice to add the tables names also.
Create an alias for sqlplus (put it in .bashrc ):
alias sqlplus='rlwrap -f $HOME/.sql.dict sqlplus'
Created by Dr. Xi on January 09, 2012 09:13:38
Last update: January 09, 2012 09:14:18
Unlike CVS, svn does not have a tag command, you create a new tag with copy :
$ svn copy http://svn.example.com/repos/calc/trunk...
The -r flag may be used to create a tag from an earlier revision:
-r [--revision] ARG : ARG (some commands al...
Created by Dr. Xi on November 11, 2011 10:05:22
Last update: November 11, 2011 10:12:01
This is an HTML image tag filter using Java regex. It takes a string, finds the img tags, replaces the src attribute with one provided by the filter, then adds a class name to the class attribute.
import java.util.regex.*;
import java.io.*;
...
Test file:
<div id="HTML snippet">
<img src="img/big/txt-m...
Created by Dr. Xi on July 15, 2011 09:25:15
Last update: July 15, 2011 09:25:15
Some methods to search for a substring within a string:
To know that a substring indeed exists within a string:
boolean found = wholeString.contains(substring);
To find where the substring is contained:
int index = wholeString.indexOf(substring);
If the substring is regex:
boolean match = wholeString.matches(".*" + substri...
Case insensitive match: convert both whole string and substring to lowercase, then compare. Or, use case insensitive flag for regex.
Test code:
import java.util.regex.*;
public class Stri...
Created by Dr. Xi on June 13, 2011 15:05:27
Last update: June 13, 2011 15:10:24
When you pass parameters from shell to Java, the list arguments may be messed up if there are spaces in the values.
Start with a simple Java test class:
public class EchoParams {
public static voi...
Tests:
$ java EchoParams a b c
Arg: a
Arg: b
Arg...
Now wrap the command in a shell script ( echoparams.sh ):
#!/bin/sh
java EchoParams $*
Tests:
$ ./echoparams.sh a b c
Arg: a
Arg: b
Arg...
The quotes had no effect on the parameters list.
Changing $* to $@ produces the same results.
The correct way to quote the args list is: "$@"
#!/bin/sh
java EchoParams "$@"
Test:
$ ./echoparams.sh a b "c d" "1 2 3 4 5"
Arg: a
...
Created by Dr. Xi on April 28, 2011 11:06:03
Last update: April 28, 2011 11:06:03
The Java Executor interface replaces the call new Thread(new RunnableTask()).start() with executor.execute(new RunnableTask()) . The concurrent package provides built-in utility classes to manage threads so that you don't need to worry about them.
import java.util.concurrent.TimeUnit;
import ja...
Created by Dr. Xi on April 28, 2011 08:58:03
Last update: April 28, 2011 08:58:03
The java.util.concurrent.atomic package is a small toolkit of classes that support lock-free thread-safe programming on single variables .
This is an example of a shared counter without synchronization or lock:
import java.util.concurrent.atomic.AtomicInteger;
...
