PowerShell in 10 Minutes
Ownership of Microsoft· Scripting language designed especially for system administrators.
· Targeted for management and administration systems
· Object Oriented based pipelines
· Perform C #, WMI, XML, Active Directory and. NET
WORK ENVIRONMENT
console
• Lets you run PowerShell cmdlets
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Editors Scripts
· Allow execute PowerShell cmdlets
· Provide intellisense
· They add colors for easier reading of code
· Information about cmdlets available
· Examples: PowerGUI and PowerShell ISE (Native)
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Run external scripts
• The default policy has PowerShell Script Execution strict, not allowing any external script.
• We need to change the execution policy scripts
One. Open the console in administrator mode
2nd. Run the following command:
Set-ExecutionPolicy-ExecutionPolicy Unrestricted
*** ***Different types of policies
| Restricted | Do not run any script allows external PowerShell. Default behavior is PowerShell. |
| AllSigned | Only run scripts that contains a digital signature, whether internal or from the internet. |
| RemoteSigned | Recommended. Scripts from the internet need to contain a digital signature. When not contain, asking if you really want to run the script from that user. |
| Unrestricted | Does not require any authorization (digital signature) to run the script. |
| Bypass | The responsibility for safety is totally up to the user. |
SYNTAX OF POWERSHELL
variables
Defined with the prefix $
example:
$ var1 = “Rui”
pipelines
• Allow use the output of an invocation in PowerShell (cmdlet, function) as input to another invocation.
• Greatest strength of PowerShell
• Simplify code
• Represented as “|”
• Allow access to the element that is in the pipe through command $ _
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Cmdlets (command-lets)
• Functions that encapsulate code
• Simple syntax, verb-name (Get-Process, Set-Partition, etc. ..)
• Ability to contain parameters
• Parameters defined prefix “-”, which may be positional ie after a specific position.
example:
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Alias Cmdlet
• Names simplified for faster writing a cmdlet.
• Example:
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Print to console
• Allows you to print a variable, return a cmdlet or function to the PowerShell console.
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Read console
• Allows you to read a value from the PowerShell console.
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get Help
• Cmdlet which gives help on the commands and their respective parameters.
• Write in the console followed by the Get-Help command
example:
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Comparison operators
| Operator | PowerShell |
| equals | -eq |
| diferent | -ne |
| greater than | -gt |
| lower than | -lt |
| greater than equal | -ge |
| less than equaligual | -le |
| Compare with wilcards | -like ou -notlike |
| compare string withregex | -match ou -notmatch |
| If array has value (or string) | -contains |
Logical operators
| Operator | PowerShell |
| and | -and |
| or | -or |
| exclusive or | -xor |
| not | ! -nor |
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Booleans
Arrays e Hashmaps
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If-then-else
logical routine that allows you to create a scenario with two possible executions due to the validation of a condition.
example:
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foreach
logical routine that lets you scroll through all objects stored in a variable with one or more dimensions
example:
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foreach a pipeline
logic that allows traverse all objects stored in a variable in one or more dimensions passed into a pipeline
example:
NOTE: This cmdlet has an alias often used “%” ie we can replace the foreach by%http://powershellpt.files.wordpress.com/2013/01/clip_image0404_thumb.jpg?w=244&h=92&h=92
REUSE OF CODE
functions
• encapsulate code
• Create custom cmdlets
• Ability to contain parameters
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Saving a Script
• Easy to edit scripts
�� Enable reuse scripts
• Extension. ps1
• Allow import of scripts for later reuse functions
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Reuse a script
- Import the script that has the function you want to use
- Use it as any other cmdlet
• Allow you to reuse code
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Chamar função .net
• Add the DLL namespace between square brackets
• At C++ style, just add :: followed by the function you want to call
Example:
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More Info
• http://technet.microsoft.com/en-us/scriptcenter/dd742419.aspx
• http://technet.microsoft.com/pt-br/library/bb978526.aspx
• http://technet.microsoft.com/pt-br/library/dd367858(v=WS.10).aspx
• http://www.windowsitpro.com/topics/powershell-scripting/don-jones-on-powershell
See Also
Aboute me
http://powershellpt.files.wordpress.com/2013/01/clip_image0554_thumb.jpg?w=113&h=113&h=113
Rui Pedro Machado
Graduation in Technologies and Information Systems
Post Graduation in Business Intelligence
Software Engineer at DevScope (www.devscope.net)
Blog: http://rpmachado.wordpress.com
Facebook: http://facebook.com/ruimachado89
Linkedin: http://www.linkedin.com/in/rpmachado