Enable Java assertion

Just a soft reminder in case I want to use Java assertion. Given a class Cls:

> java -ea:Cls Cls

The comment will execute Cls which assertion enabled.

Remove system folder in windows explorer

Some program will create a system folder which could be viewed in your windows explorer. Sometimes when uninstalling the program, they cannot remove the system folder for you. To remove it, find those system folder are in:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
\CurrentVersion\Explorer\MyComputer\NameSpace\

References are from technospot

IE progress bar keeps loading

Solution and discussion found in:

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q320731

http://dangermoose.blogspot.com/2006/01/why-status-bar-keeps-loading-in.html

Moodle error: Query failed in load_user_capability

In Moodle 1.8 platform, whenever you encounter the captioned error during login, the /var is likely to be full.

The solution, obviously... clean up the /var to feed more free space to it.

Tracing IP and e-mail header information

I found some resources for tracing IP and e-mail header stuff...

Find the IP of the e-mail sender via header:
http://www.infobanc.com/articles/faida5_12.htm

Trace the IP location:
http://visualroute.visualware.com/

List and comparisons of emulators...

Mayank Sharma provided a nice articles on some alternative emulators other than VPC:

Ref:  http://www.linux.com/articles/60742

They are QEMU, Bochs, Virtual Box, VMware Player and VMware server...

phpgraphy album title length

The title length of albums could be modified at:
found in file "/base/include/yorsh-varval-request_data.inc.php"

field dirtitle

verison 0.93.

apache: /libphp5.so: cannot restore segment prot after reloc: Permission denied

If apache cannot start, with error: /libphp5.so: cannot restore segment prot after reloc: Permission denied, try the following:

% setenforce 0

VsFTP 500 OOPS: cannot change directory

cannot change directory:/home/***
500 OOPS: cannot change directory:/home/*******
500 OOPS: child died

Solution (in prompt)
% setsebool ftpd_disable_trans 1
% service vsftpd restart

To make the effect working even reboot, add option -P in setsebool

Reference: http://www.phpchina.com/14881/viewspace_8888.html

Using find command in Unix

Just for my memory...

find . -exec grep "keywords" '{}' \; -print

This handly statement finds files contains "keywords" and print the line and the file name as well.

Ref: http://www.athabascau.ca/html/depts/compserv/webunit/HOWTO/find.htm#EX03