Powershell

Basic notes for powershell and its explanations

In Powershell, Get-Help, Get-Command, Get-Alias are the most handful commands to ever exist

Aliases are the shorthand notes for the commandlets, it lets to identify the correct commandlet of the specified alias

Get-Alias iwr

Provides help of the specified commandlet, if -Examples is specified the usage examples are also provided

Get-Help Get-ChildItem
Get-Help Get-ChildItem -Examples

Lists the available commandlets with the sepecified noun and verb

Get-Command "Get-*"
Get-Command "*-Service"

Know the propeties of a command

Get-NetTCPConnection | Get-Member

Reference

$_ --> refers to the element which is piped

Referncing with conditions

# ? --> alias to where 
# $_ --> refers to the ouptut of the Get-NetTCPConenction
# LocalAddress --> an members of the Get-NetTCPConnection cmdlet
Get-NetTCPConnection | ? {$_.LocalAddress -eq "127.0.0.1"}
Get-NetTCPConnection | Where-Object {$_.LocalAddress -eq "127.0.0.1"}

Only select contents whose contents are not empty

# $null --> value of the emptry string in powershell
Get-Process | ? {$_.Path -ne $null } | Select-Object path

Head / tail in powershell

# head
Get-Process | Get-Member | Select-Object -First 10
# tail
Get-Process | Get-Member | Select-Object -last 10

The gettype() is used to identify the output type from a command
Based on the type of output, we can query it accordingly

(whoami).gettype()
(ls).gettype()

Once the type is identified, the parameters that support the ouptut of the commandlet can be identified with Get-Member

whoami | Get-Member

The methods and properties of the specified commandlet can be accessed with (). operator

# accessing property
(whoami).length

# accessing mehtod
(whoami).ToUpper()

The commands can be nested or can be used as a subset with the ()
The Format-Table, Format-List, Format-Custom are common ways to show an output

(New-Object -com "Microsoft.Update.AutoUpdate").Results | Format-List

The 2>/dev/null equivalent of powershell is -ErrorAction

Get-ChildItem -ErrorAction 'SilentlyContinue'

ls -la of powershell Get-ChildItem -Force

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Last updated 2 years ago

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# ? --> alias to where # $_ --> refers to the ouptut of the Get-NetTCPConenction # LocalAddress --> an members of the Get-NetTCPConnection cmdlet Get-NetTCPConnection | ? {$_.LocalAddress -eq "127.0.0.1"} Get-NetTCPConnection | Where-Object {$_.LocalAddress -eq "127.0.0.1"}