PS Script to prompt for a computer name to obtain up time information

Question

Good morning everyone and please excuse the interruption.
I found this particular script online that when executed can tell me the uptime of a computer (from the looks of it, it only works on the computer it is run on)
Is there a way to modify the script so it can do the following:
prompt me to enter a computer name
display the uptime of said computer entered
This script says I would need to insert a line with all the computer names i want it to look for, which to me, is too much info.
# Get-Uptime.ps1
# This script will report uptime of given computer since last reboot.
# Pre-Requisites: Requires PowerShell 2.0 and WMI access to target computers (admin access).
# Usage syntax:
# For local computer where script is being run: .\Get-Uptime.ps1.
# For list of remote computers: .\Get-Uptime.ps1 -ComputerList "c:\temp\computerlist.txt"
# Usage Examples:
# .\Get-Uptime.ps1 -Computer ComputerName
# .\Get-Uptime.ps1 -ComputerList "c:\temp\computerlist.txt" | Export-Csv uptime-report.csv -NoTypeInformation
# Last Modified: 3/20/2012
# Created by
# Bhargav Shukla
# http://blogs.technet.com/bshukla
# http://www.bhargavs.com
# DISCLAIMER
# ==========
# THIS CODE IS MADE AVAILABLE AS IS, WITHOUT WARRANTY OF ANY KIND. THE ENTIRE
# RISK OF THE USE OR THE RESULTS FROM THE USE OF THIS CODE REMAINS WITH THE USER.
#Requires -Version 2.0
param
[Parameter(Position=0,ValuefromPipeline=$true)][string][alias("cn")]$computer,
[Parameter(Position=1,ValuefromPipeline=$false)][string]$computerlist
If (-not ($computer -or $computerlist))
$computers = $Env:COMPUTERNAME
If ($computer)
$computers = $computer
If ($computerlist)
$computers = Get-Content $computerlist
foreach ($computer in $computers)
$Computerobj = "" | select ComputerName, Uptime, LastReboot
$wmi = Get-WmiObject -ComputerName $computer -Query "SELECT LastBootUpTime FROM Win32_OperatingSystem"
$now = Get-Date
$boottime = $wmi.ConvertToDateTime($wmi.LastBootUpTime)
$uptime = $now - $boottime
$d =$uptime.days
$h =$uptime.hours
$m =$uptime.Minutes
$s = $uptime.Seconds
$Computerobj.ComputerName = $computer
$Computerobj.Uptime = "$d Days $h Hours $m Min $s Sec"
$Computerobj.LastReboot = $boottime
$Computerobj

Answer 1

i think i understand so instead of the parameter where its reading from a computer list i should remove that and use the calculated properties as a param?
No, the calculated property is only for output. Here's a quick example:
$computerList = Read-Host 'Enter computer name'
foreach ($computer in $computerList) {
Get-WmiObject Win32_OperatingSystem -ComputerName $computer |
Select @{N='ComputerName';E={$computer}},
@{N='LastBootupTime';E={[System.Management.ManagementDateTimeConverter]::ToDateTime($_.LastBootUpTime)}},
@{N='Uptime';E={(Get-Date) - ([System.Management.ManagementDateTimeConverter]::ToDateTime($_.LastBootUpTime))}}
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