Windows PowerShell

# set an environment variable
[Environment]::SetEnvironmentVariable('KEY', 'VALUE', [EnvironmentVariableTarget]::User)

# get an environment variable
[Environment]::GetEnvironmentVariable('KEY', [EnvironmentVariableTarget]::User)

# delete an environment variable
[Environment]::SetEnvironmentVariable('KEY', $null, [EnvironmentVariableTarget]::User)

$newpwd = Read-Host "Enter the new password" -AsSecureString
Set-ADAccountPassword jfrost -NewPassword $newpwd -Reset -PassThru | Set-ADuser -ChangePasswordAtLogon $True

# Filter users by a certain field
get-aduser -filter "department -eq 'marketing' -AND enabled -eq 'True'"

# Reset password for users in a certain field and force password reset
get-aduser -filter "department -eq 'marketing' -AND enabled -eq 'True'" | Set-ADAccountPassword -NewPassword $newpwd -Reset -PassThru | Set-ADuser -ChangePasswordAtLogon $True

# Force password reset for users in a certain field
get-aduser -filter "department -eq 'marketing' -AND enabled -eq 'True'" | Set-ADuser -ChangePasswordAtLogon $True

Source:

• Reset a user password with PowerShell (4sysops.com)

• What is PowerShell? (docs.microsoft.com)