Find User SID using Powershell

These snippets allow to find a local or AD user SID or get the username from the SID

	<#
	.SYNOPSIS
	Finds SID for a local user account.
	.DESCRIPTION
	Returns the SID of a local user account. To find the SID for an active directory user use
	findADSID instead
	.PARAMETER $user
	The user for which to find the SID
	.EXAMPLE
	PS C:\> findLocalSID -user Guest
	.INPUTS
	System.String
	.OUTPUTS
	System.String
	.LINK
	about_functions_advanced
	.LINK
	about_comment_based_help
	#>
	function findLocalSID($user) {
	$Objuser = New-Object System.Security.Principal.NTAccount($user)
	$strSID = $Objuser.Translate([System.Security.Principal.SecurityIdentifier])
	return $strSID.Value
	}
	<#
	.SYNOPSIS
	finds the SID for an Active directory user
	.DESCRIPTION
	returns a string in the form of an sid
	.PARAMETER $domain
	the domain the user belongs to
	.PARAMETER $user
	the domain user
	.EXAMPLE
	PS C:\> findADSID -domain <domain> -user <user>
	.INPUTS
	System.String
	.OUTPUTS
	System.String
	.LINK
	about_functions_advanced
	.LINK
	about_comment_based_help
	#>
	function findADSID{
	param(
	[Parameter(Mandatory = $true)]
	$domain,
	[Parameter(Mandatory = $true)]
	$user)
	$Objuser = New-Object System.Security.Principal.NTAccount($domain,$user)
	$strSID = $Objuser.Translate([System.Security.Principal.SecurityIdentifier])
	return $strSID.Value
	}
	<#
	.SYNOPSIS
	find User id based on SID Value
	.DESCRIPTION
	returns user name
	.PARAMETER $sid
	sid value (not quoted)
	.EXAMPLE
	PS C:\> findUserFromSID S-1-5-21-2213100911-2073097868-631715938-506
	.INPUTS
	System.String
	.OUTPUTS
	System.String
	.NOTES
	Additional information about the function goes here.
	.LINK
	about_functions_advanced
	.LINK
	about_comment_based_help
	#>
	function findUserFromSID{
	param(
	[Parameter(Mandatory = $true)]
	$sid
	)
	$objSID = New-Object System.Security.Principal.SecurityIdentifier($sid)
	$Objuser = $objSID.Translate([system.Security.Principal.NTAccount])
	return $Objuser.Value
	}

view raw find_userSID.ps1 hosted with ❤ by GitHub

Rename all files in directory using powershell part 2

Using Powershell 4 :

	#Rename all files in a directory , setting all characters to lowercase and excluding directories
	gci -Path D:\temp\ -File -Filter "txt*" | foreach{$_| Rename-Item -NewName $_.Name.ToLower()} -ErrorAction SilentlyContinue
	#Rename all files in a directory , change only the first letter to lowercase
	gci -Path D:\temp\ -File -Filter "*.txt" | foreach{$_| `
	Rename-Item -NewName $($_.Name.substring(0,1).Tolower() + $_.Name.Substring(1))} -ErrorAction SilentlyContinue
	#rename only x first file in directory , changing the first letter to lower case, if the source equals the destination we get an error message
	gci -Path D:\temp\ -File -Filter "*.txt" | Select-Object -First 9 | foreach{$_| `
	Rename-Item -NewName $($_.Name.substring(0,1).Tolower() + $_.Name.Substring(1))} -ErrorAction SilentlyContinue
	#test if first letter is uppercase or lowercase to avoid errors
	gci -Path D:\temp\ -File - Filter "*.txt"| Select-Object -First 10| foreach{$_| Rename-Item -NewName $(if($_.name.substring(0,1) -cmatch "[a-z]") {$_.Name.substring(0,1).ToUpper() + $_.Name.Substring(1)}
	elseif ($_.Name.substring(0,1) -cmatch "[A-Z]") {$_.Name.substring(0,1).ToLower() + $_.Name.Substring(1)})
	} -ErrorAction SilentlyContinue

view raw ren_all_files_in_dir.ps1 hosted with ❤ by GitHub

Rename all files in a directory using Powershell

	#All the files in the directory are uppercase i.e "TEST.TXT"
	#We set the first letter to lowercase for this example
	gci -Path D:\temp\ -File -Filter "*.txt" | foreach{$_| `
	Rename-Item -NewName $($_.Name.substring(0,1).Tolower() + $_.Name.Substring(1))} -ErrorAction SilentlyContinue

view raw renameAllDirFiles.ps1 hosted with ❤ by GitHub