File Systems in .NET

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Figure 1111 This XML le describes le shares to be created
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Listing 1112 Creating a Bunch of Shares with Explicit Access Control
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########################################### # Create a bunch of shares with permissions # (C) Dr Holger Schwichtenberg, wwwIT-Visionsde ########################################### # Parameters $Computer = "" # Subs # Constants $SHARE_READ = $SHARE_CHANGE $SHARE_FULL = $SHARE_NONE =
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1179817 = 1245462 2032127 1
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$ACETYPE_ACCESS_ALLOWED = 0 $ACETYPE_ACCESS_DENIED = 1 $ACETYPE_SYSTEM_AUDIT = 2 $ACEFLAG_INHERIT_ACE = 2 $ACEFLAG_NO_PROPAGATE_INHERIT_ACE = 4
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$ACEFLAG_INHERIT_ONLY_ACE = 8 $ACEFLAG_INHERITED_ACE = 16 $ACEFLAG_VALID_INHERIT_FLAGS = 31 $ACEFLAG_SUCCESSFUL_ACCESS = 64 $ACEFLAG_FAILED_ACCESS = 128 # Get Trustee function New-Trustee($Domain, $User) { $Account = new-object systemsecurityprincipalntaccount("itv\hs") $SID = $AccountTranslate([systemsecurityprincipalsecurityidenti er]) $useraccount = [ADSI] ("WinNT://" + $Domain + "/" + $User) $mc = [WMIClass] "Win32_Trustee" $t = $MCCreateInstance() $tDomain = $Domain $tName = $User $tSID = $useraccountGet("ObjectSID") return $t } 11 FILE SYSTEMS # Create ACE function New-ACE($Domain, $User, $Access, $Type, $Flags) { $mc = [WMIClass] "Win32_Ace" $a = $MCCreateInstance() $aAccessMask = $Access $aAceFlags = $Flags $aAceType = $Type $aTrustee = New-Trustee $Domain $User return $a } # Create SD function Get-SD { $mc = [WMIClass] "Win32_SecurityDescriptor" $sd = $MCCreateInstance() $ACE1 = New-ACE "ITV" "Management" $SHARE_READ $ACETYPE_ACCESS_ALLOWED $ACEFLAG_INHERIT_ACE $ACE2 = New-ACE "ITV" "Sales" $SHARE_FULL $ACETYPE_ACCESS_ALLOWED $ACEFLAG_INHERIT_ACE (continues)
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Listing 1112 Creating a Bunch of Shares with Explicit Access Control (continued)
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$ACE3 = New-ACE "ITV" "Productmanagement" $SHARE_FULL $ACETYPE_ACCESS_ALLOWED $ACEFLAG_INHERIT_ACE [SystemManagementManagementObject[]] $DACL = $ACE1 , $ACE2, $ACE3 $sdDACL = $DACL return $sd } Function New-Share($Computer,$ShareName, $Path, $Comment, $Access) { # Info "Creating Share $ShareName for $Path" # Delete if exists Get-WmiObject Win32_Share -ComputerName $Computer -Filter "Name='$ShareName'" | foreach { Write-Warning "Deleting existing share $($_Name)" $_Delete() } # Create Win32_Share $MC = [WMIClass] "ROOT\CIMV2:Win32_Share" $Access = Get-SD $R = $mcCreate($Path, $Sharename, 0, 10, $Comment, "", $Access) # Result if ( $RReturnValue -ne 0) { Write-Error ("Error creating share: " + $RReturnValue); Exit} "Share was created!" } # Get XML le $doc = [xml] (Get-Content -Path h:\demo\powershell\datasystem\sharesxml) $shares = $docSelectNodes("//Share") # Loop foreach ($share in $shares) { New-Share $Computer $shareName $sharePath $sharedescription }
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Figure 1112 Creation of a bunch of shares with standard access control
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Figure 1113 Result of access control
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Summary
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In this chapter, you learned about using WPS to administer le systems WPS contains many commandlets for standard operations such as copying les (Copy-Item), moving les (Move-Item), deleting les (RemoveItem) and enumerating the content of folders (Get-ChildItem) Also, le properties can be accessed through the commandlets Get-ItemProperty and Set-ItemProperty However, there are operations that require WMI, that is, the management of le shares The PowerShell Community Extensions provide additional commandlets for le compression and the management of le system links
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C H A P T E R
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MANAGING DOCUMENTS
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In this chapter:
Text Files Binary Files CSV Files XML Files HTML Files 235 238 239 241 251
This chapter discusses the creation and use of different document types: text les, binary les, CSV les, and XML les Examples in this chapter include searching in les, importing and exporting data in the CSV format, as well as reading, changing, transforming, and formatting XML documents
Text Files
For reading les, Windows PowerShell (WPS) provides the commandlet Get-Content By default, Get-Content reads the complete le Listing 121 demonstrates the entering of a text le and the row-byrow output using the commandlet Foreach-Object Listing 121 Row-wise Entering of a Text File
$ le = Get-Content j:\documents\protocolcsv $a = 0 $ le | Foreach-Object { $a++; "Row" + $a + ": " + $_ } "Total number of rows: " + $a
12 Managing Documents
If you are interested in displaying only the number of rows, you can get this information in a much shorter way:
Get-Content j:\documents\protocolcsv | Measure-Object
Writing Files
Writing to a text le in the le system is possible with a few commandlets, especially Set-Content and Add-Content Set-Content exchanges the content, Add-Content adds contents (see Listing 122) Listing 122 Creation of and Adding to a Text File
$ le = "j:\documents\protocoltxt" "Start of new protocol le " | Set-Content $ le "New entry " | Add-content $ le "New entry " | Add-content $ le "New entry " | Add-content $ le "Content of le is now:" Get-content $ le