April 16, 2008
MCPmag.com News
http://MCPmag.com
MCPmag.com: PowerShell Operators; DNS Resolution; SBS 2008;
More
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IN THIS ISSUE:
- Prof. PowerShell: Up Close and Personal with PowerShell
Operators
- Redmond Radio: Microsoft, Yahoo Takeover Getting Hostile;
more
- IT Cert/Discussions: DNS Resolution; SBS 2008; More
- Special Offers: TechMentor Orlando; Two-Factor
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PROF. POWERSHELL: Smooth Operator
By Jeffery Hicks
Like any console, PowerShell has its own set of operators
that allow
you get accomplish things, such as performing mathematical
operations, a comparison or evaluating a logical expression.
PowerShell has many operators but you will most likely make
use of
operators from these groups:
* Arithmetic
* Comparison
* Assignment
* Logical
The Arithmetic operators are the same math operators you've
come to
know and love in the past: * + - /
PS C:> 3.14*5
15.7
PS C:> 25/5
5
PS C:> ((17-3)+4)/(6*1.2)
2.5
By default PowerShell is case-insensitive. Although you can
make
case-sensitive comparisons if you want and PowerShell fully
supports
regular expressions. PowerShell's comparison operators are a
little
different than what you may have used in the past. You can't
use the
mathematical symbols you may be used to. All operators are
preceded
by a dash:
-eq (equal)
-lt (less than)
-le (less than or equal to)
-gt (greater than)
-ge (greater than or equal to)
PS C:> $var=5
PS C:> $var -eq 5
True
PS C:> $var -lt 4
False
PS C:> $var -ge 3
True
You likely already know the main assignment operator, the
equal sign.
This operator is used to assign a value to a variable as I
did above.
But PowerShell has a few other assignment operators which
save a
few keystrokes:
+= Increment by value and Assignment
-= Decrement by value and Assignment
*= Multiply by value and Assignment
/= Divide by value and Assignment
%= Modulo by value and Assignment
PS C:> $var=10
PS C:> $var+=1
PS C:> $var
11
PS C:> $var-=1
PS C:> $var
10
PS C:> $var/=2
PS C:> $var
5
Finally, logical operators are used in more complex
evaluations:
PS C:> ($var -gt 0) -and ($var -eq 10)
True
PS C:> ($var -gt 110) -and ($var -eq 10)
False
PS C:> ($var -gt 110) -or ($var -eq 10)
True
When using the -And operator, both expressions must be True
for
the entire expression to be True. When using the -Or
operator, at
least one of the expressions must be True for the entire
expression to be True.
Once you get used to using -eq instead of = (which is
something
I still catch myself doing simply out of many years of
CMD.exe
habit), you'll find PowerShell's operators easy to use
and understand.
To learn more about the different classes of operators, at a
PowerShell prompt type: help *operator* and then look at
each
individual help topic.
Comment: http://mcpmag.com/columns/article.asp?editorialsid=2
578#post
Jeffery Hicks, MCSE, MCSA, is a Microsoft PowerShell MVP and
scripting guru for SAPIEN Technologies. Jeff is a 16 year IT
veteran
who has co-authored and written several books, courseware
and
training videos on administrative scripting and automation.
He is
the co-author of Advanced VBScript for Microsoft Windows
Administrators (Microsoft Press) and Windows PowerShell:TFM
(SAPIEN Press). His latest is WSH and VBSCript Core:TFM
(SAPIEN Press).
Check out MCPmag.com's column archive for more savvy tips
and tricks
from Jeff, Greg Shields, Chris Wolf and other frequent
contributors.
http://mcpmag.com/columns/
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REDMOND RADIO for Week of April 14
Hosted by Michael Domingo
Take a quick listen to what made news last week in the world
of
Redmond and IT:
* Microsoft's bid for Yahoo growing hostile
* Microsoft issues protocol documentation
* Windows Live OneCare 2.5 beta, Robotics Developer Studio
2008 CTP released
* Small percentage of CIOs cutting 2008 IT budgets
Plus, listen to find out how to enter the weekly Redmond
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Also check out and post your questions and issues to the new
Virtualization section at
http://mcp
mag.com/forums/default.asp?C=12.
Check out these recent posts:
SINGLE URL WON'T RESOLVE ON INTERNAL DNS: I set up a dynamic
DNS
domain for a Small Business Server so users can connect to
its
Remote Web Workplace from their homes. At home I have a
normal
W2K3 domain set up with AD integrated DNS. When I connect a
computer directly to my cable modem outside my router, I can
resolve and connect to the SBS Remote Web Workplace. When I
take
the same computer and connect it within my LAN on my W2K3
Active
Directory, it can resolve all Internet traffic and URLs
EXCEPT
the SBS Remote Web Workplace.
NetMonitor 3.1 shows that the DNS queries are not being
resolved
by my internal DNS, nor is this particular query for SBS
being
forwarded. Instead I just get an error message saying...
Read rest: htt
p://mcpmag.com/forums/forum_posts.asp?tid=4332
SBS 2008: Any word on what the size limit for the Exchange
Information Store will be in SBS 2008?
Comment: htt
p://mcpmag.com/forums/forum_posts.asp?tid=4346
MICROSOFT EXCHANGE OK BUT NO SHARE: SBS 2003 SP1 with MS
Exch
6.5 -- After installing Symantic 11.0 Management console and
End-Point Protection, user can no longer access the server
for
file share or printers. E-mail still works, but error
message
"Server not configured for transactions" pops up
every time
users try to contact the server. As everything from
contracts
to job files to QuickBooks is on server, we got shut down.
Any suggestions?
Comment: htt
p://mcpmag.com/forums/forum_posts.asp?tid=4125
NO NETWORK ACCESS, WINLOGON.EXE AT 50%: Beginning on Monday
of last week I had 5 workstations and counting (amongst 400)
that have lost the ability to connect to and authenticate to
our network server shares or AD, but yet are able to access
the Internet. The issue is also not limited to the
individual
user profile, as our own (admin) logins on the affected
systems also fail to reach these servers from affected
machines....
Read rest: htt
p://mcpmag.com/forums/forum_posts.asp?tid=4345
Want to join the discussion? Go to http://mcpmag.com/forums/ and
start posting.
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