Fix "Windows update cannot currently check for updates because the service is not running"

Go to "Control Panel" -> "System and Security" -> "Administrative Tools" -> "Services"
(or use Command Prompt and run "services.msc" to bring up Services control panel)

1: Stop Windows Update Service.

2: Rename/Delete "SoftwareDistribution" folder.
    (Full path: C:\Windows\SoftwareDistribution\)

3: Start Windows Update Service.

PowerShell - Change / Mute Audio Volume

Volume Mute Button

$obj = new-object -com wscript.shell
$obj.SendKeys([char]173)

Volume Down Button

$obj = new-object -com wscript.shell
$obj.SendKeys([char]174)

Volume Up Button

$obj = new-object -com wscript.shell
$obj.SendKeys([char]175)

** Each volume counter = 2%
Ex: Set Volume to 50%

Function Set-Speaker($Volume){ $ws = new-object -com wscript.shell;1..50 | % { $ws.SendKeys([char]174)};1..$Volume | % { $ws.SendKeys([char]175) } }
Set-Speaker(25)

PowerShell - Remote Add/Join Computers to domain

$domainAdminCred = Credential
$localAdminCred = Credential

$ScriptBlock = {
  param($domainAdminCred, $computer)
  $domain = "Domain"
  Write-Host "[processing '$computer' ...]"
  Add-Computer -DomainName $domain -Credential $domainAdminCred -OUPath "OU=group1,DC=testing,DC=com" -Restart -Force
}

$IP = "192.168.1.101"
$computer = "PC-01"
Invoke-Command $IP -ScriptBlock $ScriptBlock -ArgumentList $domainAdminCred, $computer -Credential $localAdminCred
$IP = "192.168.1.102"
$computer = "PC-02"
Invoke-Command $IP -ScriptBlock $ScriptBlock -ArgumentList $domainAdminCred, $computer -Credential $localAdminCred

DHCP Testing Command

Bring up Command Prompt and run:

netsh dhcp show server

Will receive the following result:
-----------------------------------------------------------------------------------------------
1 Servers were found in the directory service:

        Server [pdcsc.server.com] Address [192.168.100.1] Ds location: cn=pdcs
.server.com

Command completed successfully.
-----------------------------------------------------------------------------------------------

Windows 8.1 Set Network to be Private / Public

1. Use Command Prompt and run "secpol.msc"
2. Click on "Network List Manager Policies"
3. Double-click on your network
4. Click on "Tab Network Location"
5. Set "Location Type" to "Private" (or "Public")

PowerShell - Remote Configure Static/DHCP IP Address

For Static IP:

$sc = {
param($IP)
$wmi = Get-WmiObject win32_networkadapterconfiguration -filter "ipenabled ='true'";
$wmi.EnableStatic($IP, "255.255.255.0");
$wmi.SetGateways("192.168.1.1", 1);
$wmi.SetDNSServerSearchOrder(@("192.168.1.1","8.8.8.8"))
}

$IP = "192.168.1.101"
$job = Invoke-Command 192.168.1.121 -ScriptBlock $sc -ArgumentList $IP -AsJob -Credential $cred
Wait-Job $job -Timeout 20

$IP = "192.168.1.102"
$job = Invoke-Command 192.168.1.122 -ScriptBlock $sc -ArgumentList $IP -AsJob -Credential $cred
Wait-Job $job -Timeout 20

For DHCP IP:

$sc = {
$wmi = Get-WmiObject win32_networkadapterconfiguration -filter "ipenabled ='true'";
$wmi.EnableDHCP();
$wmi.SetDNSServerSearchOrder();
}

$job = Invoke-Command 192.168.1.101 -ScriptBlock $sc -AsJob -Credential $cred
Wait-Job $job -Timeout 20

$job = Invoke-Command 192.168.1.102 -ScriptBlock $sc -AsJob -Credential $cred
Wait-Job $job -Timeout 20

PowerShell - Uninstall Application for Lab Computers Simultaneously

# Loop through the server list
Get-Content -Path "C:\Scripts\Computers.txt" | %{

  # Define what each job does
  $ScriptBlock = {
    param($server)
    Write-Host "[processing '$server' inside the job]"
    $app = Get-WmiObject -Class Win32_Product -computer $server -Filter "Name = 'Java 7 Update 60'"
    $app.Uninstall()
    Start-Sleep 60
  }

  Write-Host "processing $_..."

  # Execute the jobs in parallel
  Start-Job $ScriptBlock -ArgumentList $_
}

Get-Job

While (Get-Job -State "Running")
{
  Start-Sleep 10
}

Get-Job | Receive-Job

PowerShell - Add/Join Computer to domain

$pc = "PC-01"
$domain = "Domain"
$user = "Administrator"
$pass = cat C:\securestring.txt | convertto-securestring
$username = "$domain\$user"
$computer = "NewPCName"
$credential = New-Object System.Management.Automation.PSCredential($username,$pass)
Add-Computer -ComputerName $pc -DomainName $domain -newname $computer -OUPath "OU=group1,DC=testing,DC=com" -Restart -Force -Credential $credential
EXIT

PowerShell - Remove/Unjoin Computer from domain

$pc = "PCName"
$user = "Administrator"
$pass = cat C:\securestring.txt | convertto-securestring
$cred = new-object -typename System.Management.Automation.PSCredential -argumentlist "$pc\$user",$pass
$domain = "Domain"
$user2 = "Administrator"
$pass2 = cat C:\securestring2.txt | convertto-securestring
$domcred = new-object -typename System.Management.Automation.PSCredential -argumentlist "$domain\$user2",$pass2
Remove-Computer -Computer $pc -UnjoinDomainCredential $domcred -LocalCredential $cred -Workgroup workgroup -PassThru -Force -restart

PowerShell - Write Credentials to File

$FilePath = "C:"
Write-Host "Enter login as domain\id:"
Read-Host | Out-File $FilePath\id.txt

Write-Host "Enter user password:"
Read-Host -AsSecureString | ConvertFrom-SecureString | Out-File $FilePath\securestring.txt

icacls - Manage file/folder permission to users via the command line

Manage in Command Prompt:

icacls C:\Users\Public\Desktop\Share /grant Everyone:(OI)(CI)F

Manage in PowerShell:

icacls C:\Users\Public\Desktop\Share /grant "Everyone:`(OI`)`(CI`)F"

WMIC - Uninstall application via the command Line

WMIC - Windows Management Instrumentation Command-line

Use Command Prompt and enter "WMIC" to bring up wmic mode

wmic:root\cli>

Generate a list of installed applications.

product get name

Uninstall a specific application (Ex: uninstall Java 7 Update 51)

product where name="Java 7 Update 51" call uninstall
Enter "Y" to continute the uninstallation process

Local Group Policy - Force Windows 7 to Work/Private Network

Open "gpedit.msc" -> Go to Computer Configration –> Windows Settings –> Security Settings –> Network list manager

Mac OS X - Enable Screen Sharing (VNC) via the command line

The following command should be typed as one line of text.

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -activate -configure -access -on -clientopts -setvnclegacy -vnclegacy yes -clientopts -setvncpw -vncpw VNCPASSWORD -restart -agent -privs -all

PowerShell - Change Computer Name

Execute the command below and restart the computer.

$computerName = Get-WmiObject Win32_ComputerSystem
$name = "New Computer Name"
$computername.rename("$name")

Mac OS X - Install wget via the command line

curl -O http://rudix.googlecode.com/files/wget-1.12-0.dmg
hdiutil mount wget-1.12-0.dmg
sudo installer -package /Volumes/wget.pkg/wget.pkg -target "/Volumes/Macintosh HD"
hdiutil unmount "/Volumes/wget.pkg/"

Enable VNC Remote Controll Macbook Pro

1. Go to System Preferences -> Sharing -> Remote Management
2. Check "Allow access for All Users"
3. Click on "Computer Settings"
4. Check "Anyone may request permission to control screen"
5. Check "VNC viewers may control screen with password" (Enter your own password)
6. Hit "OK" and done.

PowerShell - How to Enable-PSRemoting on Windows XP

1. Use Command Prompt and run "Secpol.msc" to bring up Local Security Settings.
2. Go to Local Policies -> Security Options
3. Double click on "Network access: Sharing and security model for local accounts"
4. Change to "Classic - local users authenticate as themselves" and hit OK.
5. Enter PowerShell and execute the following commands:

Enable-PSRemoting -Force
Set-Item wsman:\localhost\client\trustedhosts *
Restart-Service WinRM

Done!

iPhone/iOS - Change Mac Addres

Supported version: All iOS version (3,4,5, 6, 7)

Change mac address:

nvram wifiaddr=XX:XX:XX:XX:XX

Restore to the original mac address:

nvram -d wifiaddr

Restart iPhone after executing change/restore command above to finish the process:

reboot