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Help Get-EventLog
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Here s another cool trick that PowerShell offers: tab completion. This enables you to type a portion of a command name, and then press Tab. The shell will complete what you ve typed with the closest match; you can continue pressing Tab to cycle through alternative matches.
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TRY IT NOW Type Help Get-Ev and press Tab. My first match is Get-Event,
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which isn t what I want; pressing Tab again brings up Get-EventLog, which is what I m after. I can hit Return to accept the command and display the help for that cmdlet. You can continue to use wildcards. If PowerShell only finds one match to whatever you ve typed, it won t display a list of topics with just that one item. Instead, it will display the contents for that item.
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TRY IT NOW Run Help Get-EventL* and you should see the help file for GetEventLog, rather than a list of matching help topics.
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If you ve been following along in the shell, you should now be looking at the help file for Get-EventLog. This is called the summary help, and it s meant to be a short description of the command and a reminder of the syntax. This is useful when you need to quickly refresh your memory on a command s usage, and it s where we ll begin interpreting the help file itself.
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Above and beyond
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Sometimes, I ll need to share a little bit of information that, although nice, isn t essential to your understanding of the shell. I ll put that information into an Above and beyond section, like this one. If you skip these, you ll be fine; if you read them, you ll often learn about an alternative way to do something, or get a bit of additional insight into PowerShell.
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Interpreting the help
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(continued) I mentioned that the Help command doesn t actually search for cmdlets; it searches for help topics. When every cmdlet has a help file, that works out to pretty much the same thing. But there is a way to directly search for cmdlets: the Get-Command cmdlet. It has an alias, Gcm, which makes typing it a bit easier. Like the Help cmdlet, Gcm accepts wildcards, meaning that you can run something like Gcm *event* to see all commands that contain event in their name. For better or worse, that list will include not only cmdlets, but also external commands like netevent.dll, which may not be very useful. A better approach is to use the -Noun or -Verb parameters. Because only cmdlet names have nouns and verbs, the results will be limited to cmdlets. Gcm -noun *event* will return a list of cmdlets dealing with events; Gcm -verb Get will return all cmdlets capable of retrieving things. You can also use the -CommandType parameter, specifying a type of cmdlet: Gcm *log* -type cmdlet will show a list of all cmdlets that include log in their names, and the list won t include any external applications or commands.
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Interpreting the help
PowerShell s cmdlet help files have a particular set of conventions. Learning to understand what you re looking at is the key to extracting the maximum amount of information from these files, and to learning to use the cmdlets themselves more effectively.
Parameter sets and common parameters
Most commands can work in a variety of different ways, depending on what you need them to do. For example, here s the syntax section for the Get-EventLog help:
SYNTAX Get-EventLog [-AsString] [-ComputerName <string[]>] [-List] [<Com monParameters>] Get-EventLog [-LogName] <string> [[-InstanceId] <Int64[]>] [-Afte r <DateTime>] [-AsBaseObject] [-Before <DateTime>] [-ComputerName <string[]>] [-EntryType <string[]>] [-Index <Int32[]>] [-Message <string>] [-Newest <int>] [-Source <string[]>] [-UserName <strin g[]>] [<CommonParameters>]
Notice that the command is listed twice. That indicates that the command supports two parameter sets, there are two distinct ways in which you can use this command. Some of the parameters will be shared between the two sets. You ll notice, for example, that both parameter sets include a -ComputerName parameter. But the two parameter sets will always have at least one unique parameter that exists only in that parameter set. In this case, the first set supports -AsString and -List, neither of which are included in the second set; the second set contains numerous parameters that aren t included in the first.
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