Help file in Visual Basic .NET

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28.2 Help file
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Punctuation within the help file takes on slightly different meanings:
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[ ] Square brackets that surround any text are indicating that the text is optional. That might include an entire command ([-Name <string>]), or it
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might indicate that a parameter is positional and that the name is optional ([-Name] <string>). It can also indicate both: that a parameter is optional, and if used, can be used positionally ([[-Name] <string>]). It s always legal to use the parameter name, if you re in any doubt. [ ] Adjacent square brackets indicate that a parameter can accept multiple values (<string[]> instead of <string>). < > Angle brackets surround data types, indicating what kind of value or object a parameter expects: <string>, <int>, <process>, and so forth.
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PowerShell cheat sheet
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Always take the time to read the full help (add -full to the help command), because it provides maximum detail as well as, in most cases, usage examples.
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28.3 Operators
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PowerShell doesn t use the traditional comparison operators found in most programming languages. Instead, it uses these:
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-eq Equality (-ceq for case-sensitive string comparisons) -ne Inequality (-cne for case-sensitive string comparisons) -ge Greater than or equal to (-cge for case-sensitive string comparisons) -le Less than or equal to (-cle for case-sensitive string comparisons) -gt Greater than (-cgt for case-sensitive string comparisons) -lt Less than (-clt for case-sensitive string comparisons) -contains Returns True if the specified collection contains the object specified ($collection -contains $object); -notcontains is the reverse.
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There are logical operators used to combine multiple comparisons:
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-not Reverses True and False (the ! symbol is an alias for this operator). -and Both subexpressions must be True for the entire expression to be True. -or Either subexpression can be True for the entire expression to be True.
In addition, there are operators that perform specific functions:
-join Joins the elements of an array into a delimited string -split Splits a delimited string into an array -replace Replaces occurrences of one string with another -is Returns True if an item is of the specified type ($one -is [int]) -as Casts the item as the specified type ($one -as [int]) .. A range operator; 1..10 returns ten objects, 1 through 10 -f The format operator, replacing placeholders with values: "{0}, {1}" -f "Hello","World"
28.4 Custom property and column syntax
In chapters 7 and 8, I showed you how to define custom properties using SelectObject, or custom columns and list entries using Format-Table and Format-List respectively. Here s that hashtable syntax. You do this for each custom property or column:
@{label='Column_or_Property_Name';expression={Value_expression}}
Both of the keys, Label and Expression, can be abbreviated as l and e respectively (be sure to type a lowercase L and not the number 1; you could also use n for Name, in place of the lowercase L ).
@{l='Column_or_Property_Name';e={Value_expression}}
Pipeline parameter input
Within the expression, the $_ placeholder can be used to refer to the current object (such as the current table row, or the object to which you re adding a custom property):
@{l='ComputerName';e={$_.Name}}
28.5 Pipeline parameter input
Pipeline parameter binding was discussed in chapter 7, where you learned that there are two types of parameter binding: ByValue and ByPropertyName. ByValue occurs first, and ByPropertyName only occurs if ByValue didn t work. For ByValue, the shell looks at the type of the object that was piped in. You can discover that type name by piping the object to Gm yourself. The shell then looks to see if any of the cmdlet s parameters accept that type of input and are configured to accept pipeline input ByValue. It s not possible for a cmdlet to have two parameters binding the same data type in this fashion. In other words, you shouldn t see a cmdlet that has two parameters, each of which accepts <string> input, both of which accept pipeline input ByValue. If ByValue doesn t work, the shell switches to ByPropertyName. Here, it simply looks at the properties of the piped-in object and attempts to find parameters with the exact same names that can accept pipeline input ByPropertyName. So if the piped-in object has properties Name, Status, and ID, the shell will look to see if the cmdlet has parameters named Name, Status, and ID. Those parameters must also be tagged as accepting pipeline input ByPropertyName, which you can see when reading the full help (add -full to the help command). Figure 28.1 illustrates this process.
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