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Fri, Sep 25, 2015 10:29 pm

HTML Button Tag

You can create a clickable button on a web page with Cascading Style Sheets (CSS) as explained in Creating a button with CSS or simply use the HTML button tag, i.e. <button>label_for_button</button>. You can apply a style attribute to the button to change the background color on the button, display attributes for the text, such as bold, etc. and can specify an action that will be taken if someone clicks on the button. The button tag has been part of HTML since version 4.0.

[ More Info ]

[/network/web/html] permanent link

Wed, Sep 23, 2015 8:10 pm

Saving an image as a transparent gif using IrfanView

The freeware/shareware IrfanView program for systems running the Microsoft Windows operating system provides the capability to convert images from one image file format to another by using its "save as" feature. If you have an image, e.g., a JPEG/JPG image, that you wish to convert to a transparent GIF format, you can do so by the following steps:
  1. Open the original image file, e.g., the JPG file.
  2. If you need to do any image cleanup, you can edit the image by clicking on Edit and selecting "Show Paint dialog"; a small window will then open with image editing tools that you can use, e.g., if you need to change any stray pixels to the color you wish to use as the transparent color. You can choose View and Zoom In, if you need to zoom into the image for a closer inspection.
  3. Then, to save as a transparent gif, click on File and select Save as.
  4. For "Save as type", choose GIF - Compuserve GIF.
  5. In the JPEG/GIF save options window, choose "Save transparent color" from the GIF section. You will then have three options: "use main window color for transparency", "choose transparent color during saving", or "set transparency value to palette entry". If you choose "choose transparent color during saving" when you save the file, you will be able to click on an area in the image that contains the color you wish to use as the transparent color.

    IrfanView JPEG/GIF save options

  6. Click on Save to save the image in the new format. Note: you need to click on the Save button on the Save Picture As window, not the Save button on the JPEG/GIF save options window. A Choose transparent color window will then open. Click somewhere on the image where the color exists that you wish to be the transparent color.

[/os/windows/software/graphics/irfanview] permanent link

Tue, Sep 22, 2015 9:12 pm

Safari CPU and Memory Usage on OS X

As with many other browsers, if you leave the Safari web browser open for an extended period of time with many tabs open, you may find that the overall system performance on a Mac OS X system decreases dramatically and you may have to suffer with the "spinning beachball" when trying to do even simple tasks, such as scrolling down a web page. The problem may be due to Safari consuming a lot of CPU cycles or most of the available memory. With some browsers, such as Firefox, where I've frequently encountered peformance issues if it is left running for a couple of days with many tabs open, it is difficult to determine which tab may be the culprit. With a browser such as Chrome, where tabs are run as separate processes, it is much easier. With Safari, you can use Debug menu options to obtain per tab memory and CPU utilization information by viewing the consumption of those resources by processes associated with those individual tabs.

[ More Info ]

[/network/web/browser/safari] permanent link

Sat, Sep 12, 2015 10:32 pm

Find email messages in a mbox file using python

I wanted to locate messages from any sender at a particular domain name in the mailbox for an account on a Linux system. The server where the acount resides uses sendmail and dovecot for email and the mailbox file for the account was in mbox format. When email is stored in mbox format, all email messages in the inbox are stored in the same text file. The beginning of each email message is indicated by a line whose first five characters consist of "From" followed by a space (the so named "From_ line" or "'From ' line" or simply "From line") followed by the sender's e-mail address.

In this case, the mailbox was huge with tens of thousands of messages in a file 24 GB in size and I wanted to extract just a few pertinent messages. So I created, which can be run in either "brief" or "full" mode by changing the value of a variable named brief in the script. In brief mode, the script will just print the "from" line for any message where a sender's email address matches the specified address followed by the subject of the message and then the date the message was sent. When all messages in the file have been processed, it will print the number of matching messages found. In "full" mode, the script will print the entire email message whenever a match is found.

[/languages/python] permanent link

Fri, Sep 11, 2015 10:07 pm

Norton 360 Firewall Settings Option Grayed Out

While working on a system that had the Norton 360 software installed for antivirus protection, I wanted to ensure that I could query the system using the Simple Network Management Protocol (SNMP), but when I tried to check the Norton 360 firewall settings, I found the option to do so was grayed out. I had thought that I could check and modify the settings, if needed, by right-clicing on Norton 360 and choosing "Run as administrator", but I found that didn't work. In order to check the firewall settings I had to log into an administrator account rather than a regular user account.

[ More Info ]

[/security/firewalls/Norton_360] permanent link

Thu, Sep 10, 2015 10:42 pm

Burning an ISO Image to Disc under Mac OS X

To burn an ISO file to a disc, you can use the following steps on a Mac OS X system.
  1. Select a blank writable disc in the disc drive.
  2. Open the Finder and navigate to where the file is located.
  3. Right-click on the file, then choose Open with and Disk Utility.
  4. Select the .iso file by clicking on it, then click on the Burn button at the top of the window.

[/os/os-x] permanent link

Tue, Sep 08, 2015 8:04 pm

Changing the time stamp on a file or directory under Windows

On a Microsoft Windows system, files and directories have three time stamps associated with them: the creation time for the file or directory, the time it was last modified, and the time it was last accessed. If you wish to change any of those time stamps, you can use a utility such as the free NirCmd utility provided by Nir Sofer at NirSoft. E.g., you can change the date/time of the specified filename (creation time and modified time) using a command such as the one below:

nircmd.exe setfiletime "c:\temp\myfile.txt" "24-06-2003 17:57:11" "22-11-2005 10:21:56"

Nir also provides FolderTimeUpdate, which "scans all files and folders under the base folder you choose, and updates the 'Modified Time' of every folder according the latest modified time of the files stored in it. This tool might be useful if, for example, you backup a cluster of folders and then restore them into another disk, but the backup program doesn't restore the original modified time of the folders."

You can also use Windows PowerShell, which Microsoft has made available for Windows XP and later versions of its operating system to change those time stamps using a command similar to the following ones where name is the file or directory name for which you wish to change the time stamp:

$(Get-Item name).creationtime=$(Get-Date "mm/dd/yyyy hh:mm am/pm")
$(Get-Item name).lastaccesstime=$(Get-Date "mm/dd/yyyy hh:mm am/pm")
$(Get-Item name).lastwritetime=$(Get-Date "mm/dd/yyyy hh:mm am/pm")

[ More Info ]

[/os/windows/PowerShell] permanent link

Mon, Sep 07, 2015 8:52 pm

Entering UEFI from a Windows 8 system

I wanted to boot a Dell Inspiron 14 5000 series laptop (model number 14-5447) from a USB flash drive to perform an image backup of the internal hard disk drive (HDD). I had placed the Clonezilla backup program on a USB flash drive - see Creating a Clonezilla bootable flash drive - and wished to use it to create an image backup of the system's hard disk drive before upgrading the system from Windows 8.1 to Windows 10. But, in order to boot from the USB flash drive, I needed to change the Universal Extensible Firmware Interface (UEFI) settings to allow me to boot the system from the external USB flash drive. The steps to modify the system settings are listed at Entering UEFI from a Windows 8 system. Though these steps were written for this specific system, a similar process can be followed on other systems.

[/os/windows/win8] permanent link

Sun, Sep 06, 2015 4:55 pm

SSH Server for Windows

If you are searching for SSH server software for a Microsoft Windows system, there are a number of products to choose from, including ones that are free. Some commercial products are also free for personal use. Some of the choices include the following:
  1. Bitvise SSH Server
  2. Copssh
  3. freeSSHd
  4. OpenSSH for Windows, though development ceased years ago on it and I would no longer recommend it.
  5. PowerShell SSH Server for Windows
  6. SilverSHielD

You can also install OpenSSH server software for Cygwin.

The Bitvise SSH Server, PowerShell SSH Server for Windows, and SilverSHieLD are commercial products which have free for personal use versions.

[/reviews/software/windows/network/ssh] permanent link

Sat, Sep 05, 2015 10:48 pm

Updating a date entry from the command line in MySQL

When you update an entry for a column containing dates in a table in a MySQL or MariaDB database, you need to enclose the date in quotes. E.g.:

MariaDB [accounts]> UPDATE Invoices SET Date_Sent='2015-08-29' WHERE Name='Acme';

If you don't the contents of the date field will appear as 0000-00-00.

You also need to enclose the date in quotes when querying a database. E.g.:

MariaDB [accounts]> SELECT * FROM Invoices WHERE Date_Sent='2015-08-29';

Otherwise, you will get an empty set for the query results.

[/software/database/mysql] permanent link

Fri, Sep 04, 2015 12:44 pm

Viewing the source code for a webpage under Safari and changing the user agent

The Safari web browser from Apple doesn't by default provide a menu option that will allow you to view the underlying HTML code on a web page. But the browser does provide that capability, you merely need to enable the "Show Develop menu in menu bar" option.

Safari does provide a capability to change the user agent string it sends to websites, which sites use to identify the browser a visitor is using. Some sites may even limit access to material on the site to specific browsers. By changing the user agent the browser reports, you may be able to still view the content in such cases.

[ More Info ]

[/network/web/browser/safari] permanent link

Thu, Sep 03, 2015 9:41 pm

Resetting the password for the PRTG Network Monitor on Microsoft Windows

After you've installed the PRTG network monitoring software on a Microsoft Windows system, which provides Simple Network Management Protocol (SNMP) monitoring capabilities, when you log into the web interface for the first time, the login name and password for the default administrator login are both prtgadmin. You can leave the login name and password fields empty and click on the Default Login button to log in using these default credentials.

If you changed the password, but have forgotten the password, you can reset it by running the PRTG Administration Tool. Once you've opened the application, click on the Administrator tab then type a new password in the Password field and retype the password in the Confirm Password field. If you've also forgotten the login name you used, you will see it on that window.

PRTG Admin Tool

When you click on Save & Close, you will see the following message:

In order to activate the settings the following will be done by the PRTG Administration Tool:
- Stop and start the PRTG core server service.

The PRTG Administration Tool will close automatically afterwards.

OK to proceed?

If you are accessing the web interfce through a browser and provide the login credentials but don't see any message indicating that they are incorrect, but just see the page for entering the userid and password again, then you may need to enable cookies in the browser; I had to enable cookies in the K-Meleon browser to get past the login screen.

If you changed the port for the web interface, you can find it listed under the Web Server tab.

Note: these instructions apply to PRTG Administration Tool version V15.3.17.2995 and might not apply to other versions.

[/os/windows/software/network/snmp/prtg] permanent link

Wed, Sep 02, 2015 10:40 pm

Updating a MySQL table entry with a space in the table name

If you need to update the value for a column in a MySQL or MariaDB table, two relational database management systems named after the daughters, My and Maria, of the lead developer for the projects, Michael Widenius, where there is a space in the column name, use the backtick , aka, bakckquote, character, i.e., `, to enclose the name of the column. E.g., to update an entry in a table named "Sales" in a database named "packages", if the field was named "Work Phone", I could use the following:
MariaDB [(none)]> use personnel;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [personnel]> UPDATE Sales SET `Work Phone` = '555.555.5555' WHERE LName = 'Smith'; 
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

MariaDB [personnel]>

You can also use the command below to update the entry without first selecting the database with the Use command.

UPDATE `personnel.`Sales` SET `Work Phone` = '555.555.5555' WHERE `Sales`.`LName` = 'Smith';


    tutorialspoint - Simply easy learning

[/software/database/mysql] permanent link

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