Bala-Krishna » Error Log

How to Fix Wordpress MU Redirect Loop Installation Error

Bala Krishna — Fri, 13 Nov 2009 12:10:34 +0000

I recently encounter this issue on my client wordpress mu blog. �When i open main blog page after installation an infinite loop occur and stop at dead end in�Firefox. I searched a lot about this on wordpress forum.�Surprising, issue is stated everywhere in the forums and blog but no solution was suggested.

Why Redirect Loop?

The issue arise�because�database was not created during wordpress�installation but�word press�config file was written. WordPress�uses wp-config.php file to store database configuration. �If WordPress find this file in the �installation directory then no further installation procedure begin. WordPress now look at DB to load default blog but there is no table in the database. Again, control goes to install procedure but WordPress understand blog already installed�because�WordPress config file is present in root folder. Once again WordPress try to load blog from database and redirect loop occur. �I hope WordPress guys will fix this in future releases.

The Fix

The fix is very simple. Simply, rename or�delete WordPress config file and re-install wordpress mu. �Make sure database user you are using during installation have sufficient permission to create and manipulate database tables.

Control PHP Error Reporting With .htaccess

Bala Krishna — Sun, 06 Jul 2008 16:10:49 +0000

Create .htaccess file or use existing .htaccess file in your hosting site. Add below line at the top of file content.

# to stop php startup errors
php_flag display_startup_errors off
# to stop all php errors and warning
php_flag display_errors off

You can also control level of error reporting. Here is the .htaccess syntax:

# php directive for setting error level
php_value error_reporting integer

Example:

# report everything except run-time notices.
php_value error_reporting 8191
# report both fatal and non-fatal compile-time warnings by the Zend Engine
php_value error_reporting 128
# report run-time notices, compile-time parse errors, run-time errors and warnings
php_value error_reporting 8
# report fatal run-time errors and unrecoverable errors
php_value error_reporting 1

CubeCart 4.x.x Cross-Site Scripting Vulnerabilities

Bala Krishna — Thu, 27 Mar 2008 13:49:09 +0000

Two vulnerabilities has been discoverd in CubeCart 4.xx by Russ McRee that can be use by hackers to exploit website by cross-site scripting attacks. The search input string is not properly sanitised before passed to script for execution. This behaviour can be used by attacker to execute malicious script code in the browser to affect website. This may allow to hacker to acess administration by stealing cookies-based aunthentication scheme and destroy website.

Solution:

CubeCart has been released security patch to fix this problem that can be download from following location.

Also, CubeCart user can fix this manually by editing a single file. Please follow steps described below:

Open ini.inc.php and find at around line 134:

$data[$key] = $this->safety($val);
}

return true;

Replace with:

$data[$key] = $this->safety($val);
}

All done.

Connect to your PC over internet with SynXro

Bala Krishna — Wed, 12 Mar 2008 09:45:09 +0000

SynXro is another web based product to connect, a PC to PC; or PC to LAN connection. SynXro allows you to access all the drives of your PC and all the network drives of all PCs connected to your Local Area Network from anywhere in the world. You only need to have access of internet and modern web browser to connect to your PC. No additional software or hardware is required.

Features:

Navigate through your Local Area Network.
Remote access to LAN and/or Computer.
Remote upload and download capabilities.
Remote execution of commands.
Accessible from any location through the internet via any browser.

Get 7 Days SynXro Trail Version

Submit your website to our directory free

Bala Krishna — Wed, 23 Jan 2008 06:36:37 +0000

Thanks for the Juan to inform me of Captcha submission error in web directory module. Due to the error people was not able to submit website to our directory. You are all welcome to submit your website to our web directory absolutely free. No reciprocal required. Website will be reviewed by editor before acceptance.

Both the midphase and the powweb offer cheap web hosting and in the end it is all about personal preferences.

Linux / Unix tar command

Bala Krishna — Thu, 17 Jan 2008 19:59:38 +0000

Tar is commonly used archive in Linux/Unix platform. Tar is capable to create new archive and can add or extract files files in a archive .

Syntax

tar c [ bBeEfFhiklnopPqvwX [ 0-7 ] ] [ block ] [ tarfile ] [ exclude-file ] {-I include-file | -C directory | file | file }

tar r [ bBeEfFhiklnqvw [ 0-7 ] ] [ block ] {-I include-file | -C directory | file | file }

tar t [ BefFhiklnqvX [ 0-7 ] ] [ tarfile ] [ exclude-file ] {-I include-file | file } …

tar u [ bBeEfFhiklnqvw [ 0-7 ] ] [ block ] [ tarfile ] file …

tar x [ BefFhiklmnopqvwX [ 0-7 ] ] [ tarfile ] [ exclude-file ] [ file ... ]

Switches

	Create. Writing begins at the beginning of the tarfile, instead of at the end.
r	Replace. The named file s are written at the end of the tarfile. A file created with extended headers must be updated with extended headers (see E flag under Function Modifiers). A file created without extended headers cannot be modified with extended headers.
t	Table of Contents. The names of the specified files are listed each time they occur in the tar file. If no file argument is given, the names of all files in the tarfile are listed. With the vfunction modifier, additional information for the specified files is displayed.
u	Update. The named file s are written at the end of the tarfile if they are not already in the tar file, or if they have been modified since last written to that tarfile. An update can be rather slow. A tarfile created on a 5.x system cannot be updated on a 4.x system. A file created with extended headers must be updated with extended headers (see E flag under Function Modifiers). A file created without extended headers cannot be modified with extended headers.
x	Extract or restore. The named file s are extracted from the tarfile and written to the directory specified in the tarfile, relative to the current directory. Use the relative path names of files and directories to be extracted. If a named file matches a directory whose contents has been writ ten to the tarfile, this directory is recursively extracted. The owner, modification time, and mode are restored (if possible); otherwise, to restore owner, you must be the super-user. Character special and block-special devices (created by mknod(1M)) can only be extracted by the super user. If no file argument is given, the entire content of the tarfile is extracted. If the tar- file contains several files with the same name, each file is written to the appropriate directory, overwriting the previous one. Filename substitu tion wildcards cannot be used for extracting files from the archive; rather, use a command of the form:tar xvf… /dev/rmt/0 `tar tf… /dev/rmt/0 \| grep ‘pattern’ `When extracting tapes created with the r or u functions, directory modification times may not be set correctly. These same functions cannot be used with many tape drives due to tape drive limitations such as the absence of backspace or append capabilities.When using the r, u, or x functions or the X function modifier, the named files must match exactly the corresponding files in the tarfile. For example, to extract ./thisfile, you must specify ./thisfile, and not thisfile. The t function displays how each file was archived.
b	Blocking Factor. Use when reading or writing to raw magnetic archives (see f below). The block argument specifies the number of 512-byte tape blocks to be included in each read or write operation performed on the tarfile. The minimum is 1, the default is 20. The maximum value is a function of the amount of memory available and the blocking requirements of the specific tape device involved (see mtio(7I) for details.) The maximum cannot exceed INT_MAX/512 (4194303).When a tape archive is being read, its actual blocking factor will be automatically detected, provided that it is less than or equal to the nominal blocking factor (the value of the block argument, or the default value if the b modifier is not specified). If the actual blocking factor is greater than the nominal blocking factor, a read error will result. See Example 5 in Examples.
B	Block. Force tar to perform multiple reads (if necessary) to read exactly enough bytes to fill a block. This function modifier enables tar to work across the Ethernet, since pipes and sockets return partial blocks even when more data is coming. When reading from standard input, ‘-’, this function modifier is selected by default to ensure that tar can recover from short reads.
e	Error. Exit immediately with a positive exit status if any unexpected errors occur. The SYSV3 environment variable overrides the default behavior. (See ENVIRONMENT section below.)
E	Write a tarfile with extended headers. (Used with c, r, or u options; ignored with t or x options.) When a tarfile is written with extended headers, the modification time is maintained with a granularity of microseconds rather than seconds. In addition, filenames no longer than PATH_MAX characters that could not be archived without E, and file sizes greater than 8GB, are supported. The E flag is required whenever the larger files and/or files with longer names, or whose UID/GID exceed 2097151, are to be archived, or if time granularity of microseconds is desired.
f	File. Use the tarfile argument as the name of the tarfile. If f is specified, /etc/default/tar is not searched. If f is omitted, tar will use the device indicated by the TAPE environment variable, if set; otherwise, it will use the default values defined in /etc/default/tar. If the name of the tarfile is ‘-’, tar writes to the standard output or reads from the standard input, whichever is appropriate. tar can be used as the head or tail of a pipeline. tar can also be used to move hierarchies with the command:example% cd fromdir; tar cf – .\| (cd todir; tar xfBp -)
F	With one F argument, tar excludes all directories named SCCS and RCS from the tarfile. With two arguments, FF, tar excludes all directories named SCCS and RCS, all files with .o as their suffix, and all files named errs, core, and a.out. The SYSV3 environment variable overrides the default behavior. (See ENVIRONMENT section below.)
h	Follow symbolic links as if they were normal files or directories. Normally, tar does not follow symbolic links.
i	Ignore directory checksum errors.
-j, –bzip2	filter archive through bzip2, use to decompress .bz2 files. WARNING: some previous versions of tar used option -I to filter through bzip2. When writing scripts, use –bzip2 instead of -j so that both older and newer tar versions will work.
k size	Requires tar to use the size argument as the size of an archive in kilobytes. This is useful when the archive is intended for a fixed size device such as floppy disks. Large files are then split across volumes if they do not fit in the specified size.
l	Link. Output error message if unable to resolve all links to the files being archived. If l is not specified, no error messages are printed.
m	Modify. The modification time of the file is the time of extraction. This function modifier isvalid only with the x function.
n	The file being read is a non-tape device. Reading of the archive is faster since tar can randomly seek around the archive.
o	Ownership. Assign to extracted files the user and group identifiers of the user running the program, rather than those on tarfile. This is the default behavior for users other than root. If the o function modifier is not set and the user is root, the extracted files will take on the group and user identifiers of the files on tarfile. The o function modifier is only valid with the x function.
p	Restore the named files to their original modes, and ACLs if applicable, ignoring the present umask. This is the default behavior if invoked as super-user with the x function letter specified. If super-user, SETUID and sticky information are also extracted, and files are restored with their original owners and permissions, rather than owned by root. When this function modifier is used with the c function, ACLs are created in the tarfile along with other information. Errors will occur when a tarfile with ACLs is extracted byprevious versions of tar .
P	Suppress the addition of a trailing “/” on directory entries in the archive.
q	Stop after extracting the first occurrence of the named file. tar will normally continue reading the archive after finding an occurrence of a file.
v	Verbose. Output the name of each file preceded by the function letter. With the t function, v provides additional information about the tarfile entries. The listing is similar to the format produced by the -l option of the ls command.
w	What. Output the action to be taken and the name of the file, then await the user’s confirmation. If the response is affirmative, the action is performed; otherwise, the action is not performed. This function modifier cannot be used with the t function.
X	Exclude. Use the exclude-file argument as a file containing a list of relative path names for files (or directories) to be excluded from the tarfile when using the functions c, x, or t. Be careful of trailing white spaces. Also beware of leading white spaces, since, for each line in the excluded file, the entire line (apart from the newline) will be used to match against the initial string of files to exclude. Multiple X arguments may be used, with one exclude-file per argument. In the case where included files (see -I include-file option) are also specified, the excluded files take precedence over all included files. If a file is specified in both the exclude-file and the include-file (or on the command line), it will be excluded.
[0-7]	Select an alternative drive on which the tape is mounted. The default entries are specified in /etc/default/tar. If no digit or f function modifier is specified, the entry in /etc/default/tar with digit “0″ is the default.
-I include-file	Opens include-file containing a list of files, one per line, and treats it as if each file appeared separately on the command line. Be careful of trailing white spaces. Also beware of leading white spaces, since, for each line in the included file, the entire line (apart from the newline) will be used to match against the initial string of files to include. In the case where excluded files (see X function modifier) are also specified, they take precedence over all included files. If a file is specified in both the exclude-file and the include-file (or on the command line), it will be excluded.
-C directory file	Performs a chdir (see cd(1)) operation on directory and performs the c (create) or r (replace) operation on file . Use short relative path names for file . If file is `.’, archive all files in directory. This option enables archiving files from multiple directories not related by a close common parent.
file	A path name of a regular file or directory to be archived (when the c, r or u functions are specified), extracted (x) or listed (t). When file is the path name of a directory, the action applies to all of the files and (recursively) subdirectories of that directory. When a file is archived, and the E flag (see Function Modifiers) is not specified, the filename cannot exceed 256 characters. In addition, it must be possible to split the name between parent directory names so that the prefix is no longer than 155 characters and the name is no longer than 100 characters. If E is specified, a name of up to PATH_MAX characters may be specified.For example, a file whose basename is longer than 100 characters could not be archived without using the E flag. A file whose directory portion is 200 characters and whose basename is 50 characters could be archived (without using E) if a slash appears in the directory name somewhere in character positions 151-156.

Examples:

tar -cvvf mp3.tar *.mp3
Create mp3.tar from from all the mp3 files of current directory.

tar -xvvf mp3.tar
Extract mp3.tar file in the current directory.

tar -xvvzf mp3.tar.gz
Extract mp3.tar.gz file in the current directory.

How to extract .gz file content by gunzip utility

Bala Krishna — Sun, 13 Jan 2008 18:43:52 +0000

Like the windows, gz is common compression utility in Linux. This guide is to extract content of the .gz file by gunzip utility. Here is the command to see and extract content of the gz file.

View gz file content

gunzip -c mybackup.gz

Extract file file content in another file. you can use different file extension depend on the content of file.

gunzip -c mybackup.gz > mybackup.sql

Compress the mybackup.sql file as mybackup.gz in the current directory.

gunzip -c mybackup.sql > mybackup.gz

Here is the full details of the gzip command.

Syntax

gzip [ -acdfhlLnNrtvV19 ] [-S suffix] [ name ... ]

gunzip [ -acfhlLnNrtvV ] [-S suffix] [ name ... ]

-a–ascii	Ascii text mode: convert end-of-lines using local conventions. This option is supported only on some non-Unix systems. For MSDOS, CR LF is converted to LF when compressing, and LF is converted to CR LF when decompressing.
-c–stdout–to-stdout	Write output on standard output; keep original files unchanged. If there are several input files, the output consists of a sequence of independently compressed members. To obtain better compression, concatenate all input files before compressing them.
-d–decompress–uncompress	Decompress.
-f–force	Force compression or decompression even if the file has multiple links or the corresponding file already exists, or if the compressed data is read from or written to a terminal. If the input data is not in a format recognized by gzip, and if the option –stdout is also given, copy the input data without change to the standard ouput: let zcat behave as cat. If -f is not given, and when not running in the back ground, gzip prompts to verify whether an existing file should be overwritten.
-h–help	Display a help screen and quit.
-l–list	For each compressed file, list the following fields: compressed size: size of the compressed file uncompressed size: size of the uncompressed file ratio: compression ratio (0.0% if unknown) uncompressed_name: name of the uncompressed file The uncompressed size is given as -1 for files not in gzip format, such as compressed .Z files. To get the uncompressed size for such a file, you can use: zcat file.Z \| wc -c In combination with the –verbose option, the following fields are also displayed: method: compression method crc: the 32-bit CRC of the uncompressed data date & time: time stamp for the uncompressed file The compression methods currently supported are deflate, compress, lzh (SCO compress -H) and pack. The crc is given as ffffffff for a file not in gzip format. With –name, the uncompressed name, date and time are those stored within the compress file if present. With –verbose, the size totals and compression ratio for all files is also displayed, unless some sizes are unknown. With –quiet, the title and totals lines are not displayed.
-L–licence	Display the gzip license and quit.
-n–no-name	When compressing, do not save the original file name and time stamp by default. (The original name is always saved if the name had to be truncated.) When decompressing, do not restore the original file name if present (remove only the gzip suffix from the compressed file name) and do not restore the original time stamp if present (copy it from the compressed file). This option is the default when decompressing.
-N–name	When compressing, always save the original file name and time stamp; this is the default. When decompressing, restore the original file name and time stamp if present. This option is useful on systems which have a limit on file name length or when the time stamp has been lost after a file transfer.
-q-quiet	Suppress all warnings.
-r–recursive	Travel the directory structure recursively. If any of the file names specified on the command line are directories, gzip will descend into the directory and compress all the files it finds there (or decompress them in the case of gunzip ).
-S .suf–suffix .suf	Use suffix .suf instead of .gz. Any suffix can be given, but suffixes other than .z and .gz should be avoided to avoid confusion when files are transferred to other systems. A null suffix forces gunzip to try decompression on all given files regardless of suffix, as in:gunzip -S “” * (. for MSDOS)Previous versions of gzip used the .z suffix. This was changed to avoid a conflict with pack.
-t–test	Test. Check the compressed file integrity.
-v-verbose	Verbose. Display the name and percentage reduction for each file compressed or decompressed.
-V–version	Version. Display the version number and compilation options then quit.
-#–fast–best	Regulate the speed of compression using the specified digit #, where -1 or –fast indicates the fastest compression method (less compression) and -9 or –best indicates the slowest compression method (best compression). The default compression level is -6 (that is, biased towards high compression at expense of speed).

Clip-Share Upload Video Internal Server Error

Bala Krishna — Fri, 28 Dec 2007 15:54:52 +0000

Clip-Share is mature script to run your own video sharing website like YouTube. This script is available variety of features and options at low cost. Unfortunately, they don’t have good knowledge base to short out technical problems related to script installation. The common problem with Clipshare and other video sharing script is in video upload and? conversion module.? Here is the error i received while i tried to upload video. The script produce error in initialization of progress bar.

Error:? “returned status code 500 Internal Server Error”

Possible Solution:

Check cgi-bin directory and files permission. In the script, upload progress monitored by perl script so that cgi-bin directory and files inside directory should have 755 permission. Make the changes if applicable.
Check temp and video path setting in “cgi-bin/configs/uu_default_config.pm” file. It should point to correct folder.? Both these folder should be writable by webserver.
temp_dir? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? => ‘/home/domain/public_html/tmp/’,
upload_dir? ? ? ? ? ? ? ? ? ? ? ? ? ? => ‘/home/domain/public_html/video/’,
Check flvideo folder permission in your installation directory. It should be writable by webserver.

Permission denied error with godaddy cron job

Bala Krishna — Tue, 04 Dec 2007 19:53:19 +0000

Cron is a Linux command tool that allows you to schedule tasks unattended at a specified time interval. There are several ways to schedule commands to run. You can run any available command or script like php, perl and shell script as a Cron Job. It run specified command and send output to the user or email id specified in the configuration.

This is common error godaddy user face when they run Cron job first time. The Godaddy Cron Manager only ask for the script file to run. You need to give executable file path separately otherwise php file will be run with shell script and produce permission denied error. To over come this problem you simply need to use php executable path as first argument and full path of the script as second argument. Here is the correct Godady executable path.

Shell: /bin/sh
Perl : /usr/bin/perl
PHP4: /web/cgi-bin/php
PHP5: /web/cgi-bin/php5

Exmple Cron Job:

/web/cgi-bin/php /home/content/youraccount/html/run_cron.php

Improve GMAIL Performance

Bala Krishna — Tue, 13 Nov 2007 08:31:00 +0000

It is common problem for web developers who use firebug to debug JavaScript errors. Firebug may slow down Gmail by validating each XMLHttpRequests call. This problem is same for all ajax based application have make extensive XMLHttpRequest. Firebug is highly configurable. You can turn-off firebug for specific application or you can just enable when you need to debug an application. You can disable firebug for GMail and similar application or optimize it so that it will slow down application.

Disable Firebug

To open Firebug, Click the green (Right Sign) icon in status bar of the browser window.
Select ‘Disable Firebug for mail.google.com.’ See image for more details.

Optimize Firebug

To open Firebug, Click the green (Right Sign) icon in status bar of the browser window.
Click the Console tab.
Select Options.
Uncheck Show XMLHttpRequests.
Click the Net tab.
Select Options.
Check Disable Network Monitoring.
See Figure for more details