powershell - Zip files older than 30 days using 7zip -

i know question has been asked several times requirement different have read here , on google.

i have below folder structure.

c:\weblogs\servers\server1 c:\weblogs\servers\server2 

server 1 folder may contain folders such as:

w3svc1 w3svc2 w3svc3 

server 2 have similar folder structure.

i trying create script @ every w3svc* folder .log files older 30 days.

it create zip file called oldlogs-server*-w3svc*.zip within each such w3svc* subfolder , move older logs file. on second run move new files older 30 days respective zip file.

i not developer examples or suggestions helpful if there not existing script available.

this script believe comes closest trying achieve:

it throws error:

"\webapps\logharvest\pkzipc.exe needed"

# alias pkzip if (-not (test-path "$env:f:\webapps\logharvest\pkzipc.exe")) {     throw "$env:f:\webapps\logharvest\pkzipc.exe needed" }  set-alias sz "$env:webapps\logharvest\pkzipc.exe"   ############################################  #### variables    $filepath = "f:\weblogs\test"   $log = get-childitem -recurse -path $filepath | where-object { $_.extension -eq ".log" }   ########### end of varables ##################   foreach ($file in $log) {      $name = $file.name      $directory = $file.directoryname      $zipfile = $name.replace(".log",".7z")      sz -t7z "$directory\$zipfile" "$directory\$name"       }   ########### end of script ##########  

if (-not (test-path "$env:f:\webapps\logharvest\pkzipc.exe")) {     throw "$env:f:\webapps\logharvest\pkzipc.exe needed" }  set-alias sz "$env:webapps\logharvest\pkzipc.exe" 

you're testing path $env:f:\webapps\logharvest\pkzipc.exe, evaluates \webapps\logharvest\pkzipc.exe, since don't have environment variable $env:f. because of script looking executable on current drive, c: rather f:. causes error observed.

the next statement tries set alias $env:webapps\logharvest\pkzipc.exe. if have environment variable $env:webapps change code this:

$pkzip = "$env:webapps\logharvest\pkzipc.exe" if (-not (test-path $pkzip)) {     throw "$pkzip needed" }  set-alias sz $pkzip 

if don't have environment variable change code this:

$pkzip = "f:\webapps\logharvest\pkzipc.exe" if (-not (test-path $pkzip)) {     throw "$pkzip needed" }  set-alias sz $pkzip 

as side note: instead of creating alias script i'd use variable executable call operator (&):

& $pkzip -t7z "$directory\$zipfile" "$directory\$name" 

also, i'm not sure if pkzipc can handle 7z archives. or if supports arguments a -t7z in first place. arguments 7zip programs me.