# File Management with PowerShell 

## Get-ChildItem

Get the content of a curent directory
Alias = ls

```powershell
Get-ChildItem

Get-ChildItem C:\Windows
```

## Set-Location

Change current directory
Alias = cd

```powershell
Set-Location
```

## ACL

Windows Access Control Lists (ACLs) are a core security 
mechanism used to control access to files, 
folders, and other system objects. 
An ACL defines which users or groups are allowed 
or denied specific permissions, such as read, 
write, modify, or execute. 
Each ACL is made up of Access Control Entries (ACEs) 
that explicitly grant or restrict these permissions. 
By using ACLs, Windows ensures that only authorized users can access or modify 
resources, helping to protect system integrity and sensitive data.

### Get-Acl

for listing permision for a file

```powershell
Get-ACL "C:\mrsh\test.ps1"

$file = Get-ACL 

$file.Access

Get-ACL "C:\mrsh\test.ps1" | Format-List
```

### Set-ACL

```powershell
$acl = Get-Acl "C:\mrsh\test.ps1"
$permission = "Administrator", "FullControl", "Allow"
$accessRule = New=Object System.Security.AccessControl.FileSystemAccessRule $permission
$acl.SetAccessRule($accessRule)

Set-ACL "C:\mrsh\test.ps1" $acl
```

## File size

```powershell
$fileSize = Get-ChildItem -Path "C:\mrsh\test.ps1" -Recurse -Force | Measure-Object -Property Length -Sum

$fileSize.Sum/1KB
```