create f5 ltm virtual pool node using tmsh with input from csv

$inputCSV = "C:\path\ltm_input.csv"
$outputFile = "C:\path\ltm_output.txt"
$i=1
Import-Csv $inputCSV | ForEach-Object {

$policy = $_.policy
if ($i -eq 1)
{
 Add-Content -PassThru $outputFile -Value "modify ltm policy $policy create-draft"
 }
 $i++
}
Import-Csv $inputCSV | ForEach-Object {
 $vipportno = $_.vipportno
 $poolportno1 = $_.poolportno1
 $poolportno2 = $_.poolportno2
 $poolportno3 = $_.poolportno3
 $appname = $_.appname
 $nodeip1 = $_.nodeip1
 $nodeip2 = $_.nodeip2
 $nodeip3 = $_.nodeip3
 $vipip = $_.vipip
 $poolmember1 = $_.nodeip1 + ":"+ $_.poolportno1
 $poolmember2 = $_.nodeip2 + ":"+ $_.poolportno2
 $poolmember3 = $_.nodeip3 + ":"+ $_.poolportno3
 $fullappname = $_.vipip + ":" + $_.vipportno
 $vsname = $_.appname + "-" + $_.vipportno
 $url = $_.url
 $monitor = $_.monitor
 $persistance = $_.persistance
 $policy = $_.policy

 Add-Content -Path $outputFile -Value "create ltm node $nodeip1 fqdn { autopopulate enabled interval ttl name $nodeip1.company.com }"
 Add-Content -Path $outputFile -Value "create ltm node $nodeip2 fqdn { autopopulate enabled interval ttl name $nodeip2.company.com }"
 Add-Content -Path $outputFile -Value "create ltm node $nodeip3 fqdn { autopopulate enabled interval ttl name $nodeip3.company.com }"
 Add-Content -Path $outputFile -Value "create ltm pool pl-$appname members add { $poolmember1 $poolmember2 $poolmember3 } monitor $monitor"
 Add-Content -Path $outputFile -Value "create ltm virtual vs-$vsname destination $fullappname profiles add { wilcard-company company-program-http serverssl-insecure-compatible } pool pl-$appname description $url source-address-translation { pool Internal_SNAT } translate-address enabled vlans-enabled vlans add { External } persist replace-all-with { $persistance } source-address-translation { type snat }"
 Add-Content -Path $outputFile -Value "modify ltm policy /Common/Drafts/$policy rules add { rl-$appname { actions add { 0 { forward select virtual /Common/vs-$vsname } } conditions add { 0 { http-host host values {$url} } } description $url } }"
  }
 Add-Content -PassThru $outputFile -Value "publish ltm policy /Common/Drafts/$policy"
 Add-Content -PassThru $outputFile -Value "save sys config"
create a csv file named ltm-input.csv with columns as per the variables called

vipportno appname nodeip1 nodeip2 nodeip3 vipip poolportno1 poolportno2 poolportno3 policy persistance monitor url