December 04, 2008
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When viewing an HTML page in a Browser, the Browser often keeps this page in its cache. What can be possible advantages/disadvantages of page caching? How can you prevent caching of a certain page (please give several alternate solutions)?
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When you use the metatag in the header section at the beginning of an HTML Web page, the Web page may still be cached in the Temporary Internet Files folder.
A page that Internet Explorer is browsing is not cached until half of the 64 KB buffer is filled. Usually, metatags are inserted in the header section of an HTML document, which appears at the beginning of the document. When the HTML code is parsed, it is read from top to bottom. When the metatag is read, Internet Explorer looks for the existence of the page in cache at that exact moment. If it is there, it is removed. To properly prevent the Web page from appearing in the cache, place another header section at the end of the HTML document.
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Firewalls can't protect very well against things like viruses or malicious software (malware). There are too many ways of encoding binary files for transfer over networks, and too many different architectures and viruses to try to search for them all. In other words, a firewall cannot replace security-consciousness on the part of your users. In general, a firewall cannot protect against a data-driven attack--attacks in which something is mailed or copied to an internal host where it is then executed.

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Properly configured firewalls can limit the propagation of worms - a form of malware.  Typically, firewalls are edge or parameter devices (separates network zones) and most viruses and malware targets end points (user workstations and servers).
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Tuesday, November 06, 2007
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software, data, encoding, security, transfer, computer, firewall, viruses, malware, binary files, networks, security-consciousness, internal host
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To cut off the first column,  awk, kde   utility could be used.

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A number of Unix commands can be used - cut, awk, sed or even a Perl one-liner.
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Friday, September 07, 2007
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linux/unix, awk, kde, utility, unix commands, shell commands
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If you perform a task repeatedly in Microsoft Excel, you can automate the task with a macro. A macro is a series of commands and functions (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculat that are stored in a Microsoft Visual Basic module and can be run whenever you need to perform the task. For example, if you often enter long text strings in cells, you can create a macro to format those cells so that the text wraps.

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Tuesday, November 25, 2008
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bbfromdc123
Saturday, November 29, 2008 11:53 AM
I know I know I know...
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  • To run the count program, which will display the process identification number of the job, enter: count &
  • To check the status of your job, enter: ps
  • To bring a background process to the foreground, enter: fg
  • If you have more than one job suspended in the background, enter: fg %#

    Replace  #  with the job number, as shown in the first column of the output of the jobs command.

  • You can kill a background process by entering: kill PID

    Replace PID with the process ID of the job. If that fails, enter the following:

    kill -KILL PID
  • To determine a job's PID, enter: jobs -l
  • If you are using sh, ksh, bash, or zsh, you may prevent background processes from sending error messages to the terminal. Redirect the output to /dev/null using the following syntax: count 2> /dev/null &
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    Sunday, May 11, 2008
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