Update a Column Value for All List Items in SharePoint using PowerShell

Requirement is to update a list item in SharePoint using PowerShell. Here are some code scripts to update SharePoint list item using PowerShell script.

PowerShell to update a column value for all List items in SharePoint
The syntax for updating a specific column value on SharePoint List item goes like this:

$Web = Get-SPWeb "http://sharepoint-site-url"
$List = $web.Lists["List Name"]

foreach ($item in $list.Items)
{
  $item["ColumnName"] = "New value"
  $item.Update()
}

This PowerShell updates all list items in SharePoint. Here is an example for update all items in a SharePoint list with PowerShell:

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
#Get the List
$Web = Get-SPWeb "http://intranet.crescent.com"
$List = $web.Lists["Contacts"]

#Get all List Items
$ListItems = $List.Items

#if the Item Found
foreach($Item in $ListItems)
{
    #Update 'Company' Field Value
    $Item["Company"] = "Crescent Inc."
    $Item.Update()
} 

SharePoint PowerShell update list item by id:
Lets pick a specific list item from its ID and update it.

 
#Get the List
$Web = Get-SPWeb "http://intranet.crescent.com"
$List = $web.Lists["Contacts"]

#Get the List Item from Its ID
$ListItem = $List.GetItemById("1")

#Update 'Last Name' Column
$ListItem["Last Name"] = "Thomas Cook"
$ListItem.Update()

Update list item SharePoint 2010 using PowerShell
This script picks a list item using its field value and updates it using PowerShell.

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Get the List
$Web = Get-SPWeb "http://intranet.crescent.com"
$List = $web.Lists["Contacts"]

#Get the List Item from column value
$ListItem = $List.Items | Where { $_["Last Name"] -eq "Thomas" }

#if the Item Found
if($ListItem)
{
    #Update 'Last Name' Column
    $ListItem["Last Name"] = "Thomas Cook"
    $ListItem.Update()
}