Notes by Dr. Xi
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Created by Dr. Xi on March 08, 2013 11:40:49 Last update: March 08, 2013 11:40:49
From Version Control with Subversion, Chapter 4. Branching and Merging In Subversion, a global revision number N names a tree in the repository: it's the way the repository looked after the N th commit. It's also the name of an implicit changeset: if you compare tree N with tree N-1 , you can derive the exact patch that was committed. For this reason, it's easy to think of revision N as not just a tree, but a changeset as well. If you use an issue tracker to manage bugs, you can use the revision numbers to refer to particular patches that fix bugs—for example, “this issue was fixed by r9238.” Somebody can then run svn log -r 9238 to read about the exact changeset that...
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 February 23, 2012 14:07:40 Last update: June 25, 2012 13:40:44
The command " svn info " prints information about the current directory:
$ svn info Path: . URL: http://svn.example.c...where: Revision: is the last syncup (update) revision of the current TARGET (artifact/file/directory, whatever you call). This number bumps up to that of the current project revision number after you do an update. Last Changed Rev: is the revision number of the latest change for the current TARGET . If TARGET is a directory, it is the revision number of the latest change within the directory, including all subdirectories. However , this number is not accurate after you do a check in without a following update . The revision number for the file or directory you checked in will have higher revision number than its parent/ancestor....
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 29, 2012 12:31:15 Last update: February 29, 2012 12:31:15
Use the diff command to show the changed files for revision 730:
$ svn diff -r 729:730 --summarizeTo show the changes files between 700 and 730 (excluding 700):
$ svn diff -r 700:730 --summarize
Created by Dr. Xi on February 24, 2012 12:42:09 Last update: February 24, 2012 12:43:00
Use the copy command to restore a deleted file:
$ svn copy http://svn.example.com/path/to/svn/repo...@revision must be a revision number before the file was deleted. You can use the info command to view the info before restoring:
$ svn info http://svn.example.com/path/to/svn/repo...
Created by Dr. Xi on February 07, 2012 15:40:11 Last update: February 07, 2012 15:40:11
An alias defined in .profile does not work when you open a bash window from the desktop. Simply put, alias should be put in .bashrc ; PATH should be put in .profile . These are the facts: .profile is executed by the login shell, i.e., when you login. .bashrc is executed whenever a bash shell is opened - login or non-login. When you open a new bash window from the desktop, a non-login shell is created, it will execute .bashrc , not .profile . When you ssh to a remote system interactively, a login shell is created. When you ssh to a remote system and run a command directly, a non-login shell is created. PATH modifications should be put in .profile since it is usually...
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 rlwrapCreate 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 February 06, 2012 09:19:27 Last update: February 06, 2012 09:19:27
These are the steps to install the Oracle sqlplus command line utility on Ubuntu Linux: Get Oracle instant client packages from Oracle (you'll need basic or basiclite + sqlplus). Install the RPM files with alien :
$ sudo alien -i oracle-instantclient11.2-basic-11....Install Oracle shared libraries: create file /etc/ld.so.conf.d/oracle.conf and add this line: