PowerShellLunchAndLearn/3-CommonCommands.dib at main · clirettenetchex/PowerShellLunchAndLearn · GitHub

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#!markdown

# Common Commands
<hr />

#!markdown

### Get-Help

**Alias:** help

*note: using the `help` alias will paginate the help page*

**Description:** Displays information about PowerShell commands and concepts.

#!pwsh

Get-Help Get-Command

#!markdown

### Get-Command

**Alias:** gcm

**Description:** Used to get information on commands. Can be used on its own or by limiting search to Noun and/or Verb `Get-Command -Noun *file*`, `Get-Command -Verb *delete*`

#!pwsh

Get-Command -Name Start-Process

#!pwsh

Get-Command -Noun Process

#!pwsh

Get-Command -Verb ConvertTo

#!pwsh

Get-Command -Verb Convert* -TotalCount 5

#!markdown

### Get-Member

**Alias:** gm

**Description:** Gets the properties and methods of objects.

#!pwsh

$notepadProcess = Start-Process notepad -PassThru
Get-Member -InputObject $notepadProcess

#!markdown

### Measure-Object

**Alias:** measure

**Description:** Calculates the numeric properties of objects, and the characters, words, and lines in string objects, such as files of text.

#!pwsh

Get-Command | Measure-Object

#!pwsh

1..10 | Measure-Object -AllStats

#!markdown

### Foreach-Object

**Alias:** % or foreach

**Description:** Performs an operation against each item in a collection of input objects.

#!pwsh

1..5 | ForEach-Object { $_ }

#!markdown

### Where-Object

**Alias:** ? or where

**Description:** Selects objects from a collection based on their property values.

#!pwsh

1..5 | Where-Object { $_ -gt 3 }

#!markdown

### Select-Object

**Alias:** select

**Description:** Selects objects or object properties.

#!pwsh

1..5 | Select-Object -First 3

#!pwsh

1..5 | Select-Object -Skip 2 -First 2

#!pwsh

Get-Process | Select-Object -ExpandProperty Name -First 3

#!markdown

### Invoke-RestMethod

**Alias:** irm

**Description:** Sends an HTTP or HTTPS request to a RESTful web service.

#!pwsh

Invoke-RestMethod -Method 'Get' -Uri "https://jsonplaceholder.typicode.com/todos/1"

#!pwsh

$todos = Invoke-RestMethod -Method 'Get' -Uri "https://jsonplaceholder.typicode.com/todos"
$todos | Measure-Object

#!markdown

### Get-History

**Alias:** history or h or ghy

**Description:** Gets a list of the commands entered during the current session.

#!pwsh

Get-History

#!pwsh

Get-History -Count 5

#!pwsh

Get-History -Count 5 | Select-Object -ExpandProperty CommandLine

#!pwsh

Get-History -Count 5 | Select-Object -ExpandProperty CommandLine > commands.ps1

#!markdown

### ConvertTo-Json

**Alias:** n/a

**Description:** Converts an object to a JSON-formatted string.

#!pwsh

Get-History | Select-Object -First 2 | ForEach-Object { [pscustomobject]@{ id = $_.Id; commandLine = $_.CommandLine } } | ConvertTo-Json

#!markdown

### Format-List

**Alias:** fl

**Description:** Formats the output as a list of properties in which each property appears on a new line.

#!pwsh

# default is to output to a table
Get-History | Select-Object -First 2

#!pwsh

Get-History | Select-Object -First 2 | Format-List