Add a user or group to local administrator group

<#
    .Synopsis
        Adds a user or group to local administrator group

    .Description
        This scripts adds the given user or group to local administrators group on given list of servers.

    .Parameter ComputerName
        Computer Name(s) on which you want to add user/group to local administrators

 .Parameter ObjectType
 This parameter takes either of two values, User or Group. This parameter indicates the type of object
 you want to add to local administrators

Powershell - Split large files

#############################################
# Split a log/text file into smaller chunks #
#############################################
#
# WARNING: This will take a long while with extremely large files and uses lots of memory to stage the file
#

# Set the baseline counters
#
# Set the line counter to 0
$linecount = 0
# Set the file counter to 1. This is used for the naming of the log files
$filenumber = 1

# Prompt user for the path
$sourcefilename = Read-Host "What is the full path and name of the log file to split? (e.g. D:\mylogfiles\mylog.txt)"

# Prompt user for the destination folder to create the chunk files
$destinationfolderpath = Read-Host "What is the path where you want to extract the content? (e.g. d:\yourpath\)"

Powershell v3 cmdlets

#enable psremote through psexec
psexec \\[computer name] -u [admin account name] -p [admin account password] -h -d powershell.exe "enable-psremoting -force"

#enable ping through firewall
netsh advfirewall firewall add rule name="ICMP Allow incoming V4 echo request" protocol=icmpv4:8,any dir=in action=allow

#enable script running policy
Set-ExecutionPolicy RemoteSigned

#search an user in your domain
Get-ADUser -Filter {name -like 'name*'}

#search every locked account in domain
Search-ADAccount -lockedout -UsersOnly| format-table  userprincipalname, name, passwordexpired, lastlogondate

#unlock account
Unlock-ADAccount username -Confirm

#to get all groups that a user is member of
Get-ADprincipalgroupmembership username| select name

#change computer hostname in domain

Rename-Computer -ComputerName Srv01 -NewName Server001 -DomainCredential domain\username 
Force -PassThru -Restart