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Sat, Oct 31, 2015 10:53 pm

Driverquery

The driverquery command can be used on Microsoft Windows systems to obtain information on the device drivers in use on the system. You can use driverquery /si to determine which drivers on the system have been digitally signed and the /v option to obtain detailed, i.e., verbose, output for the drivers on the system. You can use the command wmic loadorder to obtain information on the load order for the drivers.

[ More Info ]

[/os/windows/commands] permanent link

Tue, Oct 27, 2015 10:07 pm

Installing iperf on CentOS

Iperf is a tool that can be used to determine the network bandwidth available between two end points. On one system you run iperf in server mode and on the other you run it in client mode. On both hosts iperf will report the available bandwidth. E.g., below is the output from a system running iperf in server mode:

[root@localhost install]# [  4] local 192.168.18.44 port 5001 connected with 172.25.2.72 port 55990
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.4 sec  3.00 MBytes  2.42 Mbits/sec

To install Iperf on a CentOS system with yum install iperf, you may need to configure the system to use the Extra Packages for Enterprise Linux (EPEL) repository, which you can do by issuing the command yum install epel-release. A repository is a source for software packages that can be installed with yum.

[ More Info ]

[/os/unix/linux/centos] permanent link

Mon, Oct 26, 2015 8:36 pm

Downloading a web page with Python

To download a webpage with a Python script, you can use the following, substituting the URL for the page you wish to download for the one for which you wish to download the source code:

import urllib2

url="http://www.example.com/somepage.html"

page =urllib2.urlopen(url)
source=page.read()
print source

If you wish the script to prompt for the URL and a location for a file where the source code for the web page will be stored, you can use the following:

import urllib2

url=raw_input("URL: ")
outfile=raw_input("Output file: ")

page =urllib2.urlopen(url)
source=page.read()

f=open(outfile, 'w')
f.write(source)
f.close()

The "w" in the f=open(outfile, 'w') line indicates the file should be opened for writing. Other possible modes for the file are listed below:

ModesDescription
r Opens a file for reading only. The file pointer is placed at the beginning of the file. This is the default mode.
rb Opens a file for reading only in binary format. The file pointer is placed at the beginning of the file. This is the default mode.
r+ Opens a file for both reading and writing. The file pointer placed at the beginning of the file.
rb+ Opens a file for both reading and writing in binary format. The file pointer placed at the beginning of the file.
w Opens a file for writing only. Overwrites the file if the file exists. If the file does not exist, creates a new file for writing.
wb Opens a file for writing only in binary format. Overwrites the file if the file exists. If the file does not exist, creates a new file for writing.
w+ Opens a file for both writing and reading. Overwrites the existing file if the file exists. If the file does not exist, creates a new file for reading and writing.
wb+ Opens a file for both writing and reading in binary format. Overwrites the existing file if the file exists. If the file does not exist, creates a new file for reading and writing.
a Opens a file for appending. The file pointer is at the end of the file if the file exists. That is, the file is in the append mode. If the file does not exist, it creates a new file for writing.
ab Opens a file for appending in binary format. The file pointer is at the end of the file if the file exists. That is, the file is in the append mode. If the file does not exist, it creates a new file for writing.
a+ Opens a file for both appending and reading. The file pointer is at the end of the file if the file exists. The file opens in the append mode. If the file does not exist, it creates a new file for reading and writing.
ab+ Opens a file for both appending and reading in binary format. The file pointer is at the end of the file if the file exists. The file opens in the append mode. If the file does not exist, it creates a new file for reading and writing.

If you named the script download_webpage.py, you could run it from a command line inteface, aka shell prompt, as follows:

$ python download_webpage.py
URL: http://www.example.com/somepage.html
Output file: example-somepage.html

References:

  1. Python Files I/O
    tutorialspoint - The largest Tutorials Library on the web

[/languages/python] permanent link

Thu, Oct 22, 2015 10:42 pm

Mirroring a display to an external monitor and obtaining information on it under OS X

To mirror what is displayed on a laptop's screen to an external monitor under Apple's OS X operating system, take the following steps after connecting the external monitor:
  1. Click on the Apple icon on the upper, left-hand of the screen and select System Preferences.
  2. Under Hardware, click on Displays.
  3. Click on the Arrangement tab for the display and check the check box next to Mirror Displays.

    LA2405 monitor - mirror displays

You should then see a copy of the information displayed on the laptop's builtin monitor also displayed on the external monitor.

[ More Info ]

[/os/os-x] permanent link

Tue, Oct 20, 2015 8:32 pm

Synching Google Drive from the command line

If you want to synchronize files stored on a computer with the Google Drive cloud from the command line, the only way to do so currently using the application provided by Google appears to be to kill the googledrivesync.exe process that handles the synchronization and then restart it. You can kill the processes - there are actually two of them running with the same "googledrivesync.exe" name - from the command line with taskkill /f /fi "imagename eq googledrivesync.exe" and then restart them with the command "C:\Program Files (x86)\Google\Drive\googledrivesync, assuming that the googledrivesync application is stored in the default location of "C:\Program Files (x86)\Google\Drive\.

[ More Info ]

[/network/web/services/google/drive] permanent link

Sun, Oct 18, 2015 9:00 pm

Stop Access from rounding number

For a field in an Access 2013 database that I wanted to hold the amperage for a device's power adapter, e.g., 1.5, I specified the field should be a number with a "fixed" format. But whenever I put in 1.5, Access would change it to 2. I clicked on the button to increase the number of decimal points, but Access would round the number 1.5 to 2.0 then. To resolve the problem, I clicked on View for the table and selected Design View.

Access design view

I could then see, when I selected the field that was to hold the amperage, that the Field Size value was set to Long Integer. An integer field, obviously, won't hold a fractional part for the number.

Access Long Integer field size

I set the value to Single instead by clicking in the field and selecting that option from the dropdown list, so I could store a floating point value in the field rather than an integer.

Access Single field size

From the dropdown list for field size, you can select the following values:

Setting

Description

Decimal precision

Storage size

Byte

Stores numbers from 0 to 255 (no fractions).

None

1 byte

Decimal

Stores numbers from -10^38-1 through 10^38-1 (.adp)
Stores numbers from -10^28-1 through 10^28-1 (.mdb, .accdb)

28

2 bytes

Integer

Stores numbers from -32,768 to 32,767 (no fractions).

None

2 bytes

Long Integer

(Default) Stores numbers from -2,147,483,648 to 2,147,483,647 (no fractions).

None

4 bytes

Single

Stores numbers from
-3.402823E38 to -1.401298E&45
for negative values and from
1.401298E-45 to 3.402823E38 for positive values.

7

4 bytes

Double

Stores numbers from
-1.79769313486231E308 to -4.94065645841247E-324
for negative values and from
4.94065645841247E-324 to 1.79769313486231E308 for positive values.

15

8 bytes

Replication ID

Globally unique identifier (GUID)

N/A

16 bytes

Note: you can see the values that each one can hold by hitting the F1 key to get online help on the topic after clicking on the value stored in the Field Size field while in Design View.

When I switched back to Datasheet View by clicking on View and then selecting Datasheet View, I was then able to change the value from 2.0 to 1.5 and have it remain as 1.5, i.e., Access had stopped rounding numbers to the nearest integer for the field.

References:

  1. Field Size Property

[/software/database/access] permanent link

Tue, Oct 13, 2015 9:35 pm

Obtaining the model number and serial number for a HDD from the command line

If you wish to obtain the model number and serial number for a hard disk drive (HDD) from the command line on a Microsoft Windows system, you can use the Windows Management Instrumentation command line tool wmic at a command prompt or get-wmiobject -class win32_diskdrive from a Windows PowerShell prompt.

For wmic, you can use the following command:

C:\Users\JDoe\Documents>wmic diskdrive get caption, model, serialnumber
Caption                          Model                            SerialNumber

TOSHIBA MQ01ABD075               TOSHIBA MQ01ABD075               73RISBDFS

Seagate Backup+ Desk USB Device  Seagate Backup+ Desk USB Device  NA5J4H3R

In the above example, I also included the caption parameter to get a description for the drive that may help me more easily identify it, though in this case the caption information and the model information are the same. In the above case, the Toshiba drive is the internal drive in the system while the Seagate is an external, USB-attached drive.

To use PowerShell to obtain the same information, I could use the command below:

PS C:\Users\JDoe> get-wmiobject -class win32_diskdrive | format-table Caption, Model, SerialNumber

Caption                                 Model                                   SerialNumber
-------                                 -----                                   ------------
TOSHIBA MQ01ABD075                      TOSHIBA MQ01ABD075                                 73RISBDFS
Seagate Backup+ Desk USB Device         Seagate Backup+ Desk USB Device         NA5J4H3R

You can obtain much more information on drives in PowerShell with the get-wmiobject -class win32_diskdrive | format-list * command. If the drive supports Self-Monitoring, Analysis and Reporting Technology (SMART), you can use the status command to learn if the drive may be failing or is encountering problems that could lead to a drive failue.

PS C:\Users\Jim> get-wmiobject -class win32_diskdrive | format-table Caption, Model, Status, SerialNumber

Caption                       Model                         Status                        SerialNumber
-------                       -----                         ------                        ------------
TOSHIBA MQ01ABD075            TOSHIBA MQ01ABD075            Pred Fail                                73RISBDFS
Seagate Backup+ Desk USB D... Seagate Backup+ Desk USB D... OK                            NA5J4H3R

The Toshiba drive has a status of Pred Fail, which indicates a SMART-enabled hard disk may be functioning correctly, but a failure is predicted soon. You can also retrieve the status of a drive using the wmic command.

C:\Users\JDoe\Documents>wmic diskdrive get model, status, serialnumber
Model                            SerialNumber  Status
TOSHIBA MQ01ABD075               73RISBDFS     Pred Fail
Seagate Backup+ Desk USB Device  NA5J4H3R      OK

Other parameters you can use with wmic to obtain drive information, such as the capacity of the drive, etc., are listed at Using wmic to get disk drive information.

A PowerShell command that can be used to determine which drive the operating system considers to be drive zero, drive one, etc. is shown below:

PS C:\Users\JDoe> Get-WmiObject Win32_PhysicalMedia | Format-Table Tag, SerialNumber

Tag                                                         SerialNumber
---                                                         ------------
\\.\PHYSICALDRIVE0                                                     73RISBDFS
\\.\PHYSICALDRIVE1                                          NA5J4H3R
\\.\CDROM1
\\.\CDROM0

References:

  1. Physical disk status is not OK
    Microsoft Developer Network
  2. Disk Drive Dangers - SMART and WMI
    I Programmer - programming, reviews and projects
  3. Using wmic to get disk drive information
    Date: July 10, 2010
    MoonPoint Support

[/os/windows/commands/wmic] permanent link

Mon, Oct 12, 2015 12:13 pm

MediaMonkey taking a long time to start playing music

My wife told me that MediaMonkey (MM) on her PC was taking a long time to start playing songs; it could take 20 seconds to begin playing a song after she double-clicked on it from the Windows Explorer to play the song. She showed the problem to me by having Windows 8 use Media Monkey as the default player for MP3 files. When she clicked on a song, I observed it did take as long as she reported, but when she then switched the default player to Windows Media Player, songs started playing almost immediately when she double-clicked on them. I checked the version of MediaMonkey on her system and found it was 4.1.7.1741. When I checked the MediaMonkey website at MediaMonkey >> Download, I found the current version is 4.1.9.1764. After I downloaded and installed that version, the problem no longer occurred.

[/os/windows/software/audio-video/MM] permanent link

Sun, Oct 11, 2015 5:54 pm

Adding or creating a K-Meleon Macro Module (KMM)

The open source K-Meleon web browser has its own macro language which can be used to extend the capabilities of the browser. Macros are stored in K-Meleon Macro Module (KMM) files, which can be placed in the macros directory beneath the direcory where you installed K-Meleon to make them available to all users of the browser on a system; K-Meleon runs on Microsoft Windows systems.

There are many .kmm files available for download in the K-Meleon Macro Library . Instructions for adding a KMM to a system are at K-Meleon - Adding a Macro Module. Instructions for creating macros are at K-Meleon - Creating a Macro Module.

[/network/web/browser/k-meleon] permanent link

Sat, Oct 10, 2015 4:06 pm

ACDSee Video Converter Pro - Error opening file for writing

When I attempted to install ACDSee Video Converter Pro 4.1 on my wife's computer, I received the mesage "Error opening file for writing" referencing the file CheckWinVer.exe.

ACDSee Video Converter Pro - Error opening file for writing

The problem was due to the fact that I hadn't right-clicked on the installation file and chosen "Run as administrator". When I aborted the installation and started over running it as administrator, the program installed successfully.

[/software/audio_video] permanent link

Sat, Oct 10, 2015 3:48 pm

Clearing Media Monkey and Windows Media Player Libraries

If you wish to clear the Windows Media Player (WMP) library, but not delete the music from your system, within the program while viewing your music, hit Ctrl-A to select all entries then right-click and select Delete. When a window opens prompting you as to whether you wish to delete items only from your library or wish to also delete the music files, e.g., MP3 files, from your system, leave "Delete from library only" selected and click on OK.

WMP - Delete from Library

In MediaMonkey, to clear the database, you can click on File then select Clear Database. You will then be prompted to type "YES" to ensure that you didn't inadvertently select to remove all entries from the Media Monkey music library for your account. For a family member who wanted to reinitialize her library, though, I found that after typing "YES" in all capital letters to proceed that a blue circling ring appeared for awhile, but afterwards all of the entries remained visible in the proram. If I clicked on File and selected Close or clicked on the "X" at the upper, right-hand corner of the Media Monkey window, the program would not close. When I closed the program through the Windows Task Manager, reopening it showed all the entries remained. Perhaps, because she had such an extensive music collection, the program may have been taking a long time to clear the database, but the library was never cleared after we performed several attempts to clear it. But there is another way to clear the database and start fresh. You can, instead, delete the Media Monkey database file, MM.DB. After killing the program through the Task Manager, I deleted that file, which, on a Windows 8 system is found at C:\Users\username\AppData\Roaming\MediaMonkey\MM.DB where username is the username for the account. Note: you may have to turn on the display of hidden files, folders, and drives through the Windows Explorer in order to view that location. I also deleted MM.DB-journal, which is found at that location. Then, when she reopened Media Monkey, the library was empty and she was able to add the music she wanted in the library back into it.

[/os/windows/software/audio-video] permanent link

Sat, Oct 03, 2015 7:15 pm

Controlling the volume on a Microsoft Windows system from the command line

To control the sound volume on a Microsoft Windows system, e.g., Windows 7 or 8, you can run the sndvol command from a command prompt. If you issue the command with no options, it will open the Volume Mixer that will allow you to adjust the audio volume.

Volume Mixer

You can view just the master volume slider if you use the -f option, i.e., sndvol -f.

Mixer

You can add an additional numeric parameter to the command line to control the horizontal and vertical position of the mixer window, if you wish, as explained at Windows 7 - Open the Volume Control popup from the command prompt.

[/os/windows/commands] permanent link

Fri, Oct 02, 2015 10:41 pm

Sending Encrypted Email with the OS X Mail Application

The Mail application found on Mac OS X systems supports the transmission and decoding of encrypted email that uses public key unfrastructure (PKI) certificates. You will see an open padlock icon on messages that will be sent unencrypted. If you have a public certificate for a recipient, you can click on the button with that symbol on it to encrypt the message.

OS X also provides the command line security utility for managing certificates. You can use security find-certificate email_address where email_address is the email address to which you wish to send email to determine if you already have a public certificate for the recipient in your keychain.

If you are using PKI software from Entrust on the system, you can also use it to retrieve public certificates for recipients.

[ More Info ]

[/os/os-x] permanent link

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