Powershell: Compress files

Question

I need to compress files based on the month and year they were written.

# group files based on extension month/year
$groups = Get-ChildItem C:\Users\mypath -filter "*psv.*" | Group-Object {"{0:MMMM} {0:yyyy}" -f $_.LastWriteTime }

# compress groups
ForEach ($group in $groups) {
    & "C:\Program Files\7-Zip\7z.exe" u ($group.FullName + ".7z") $group.FullName
}

The script above isn't working, however, When I run the following line alone

Get-ChildItem C:\Users\mypath -filter "*psv.*" | Group-Object {"{0:MMMM} {0:yyyy}" -f $_.LastWriteTime }

I get the following result which is fine.

However, it isn't zipping the group of files.

Answer 1

Try this:

$groups = Get-ChildItem C:\Users\mypath *psv.* | Group {"{0:MMMM}-{0:yyyy}" -f $_.LastWriteTime}
foreach ($group in $groups) { 
    foreach ($file in $group.Group.FullName) { 
         Write-Host "Processing " + $group.Name + " " + $file 
         & "C:\Program Files\7-Zip\7z.exe" u ($group.Name + ".7z") $file
    } 
}

The Group property of the GroupInfo object output by GroupInfo contains all the files that are in that grouping. You have to enumerate those files.