根据文件内容重命名文件夹中的所有txt文件

Question

Can someone please help to use PowerShell to rename individual txt files in a folder, each file needs to be renamed based on a keyword inside each individual txt file.

eg

c:\temp\1.txt may have a line like Invoice#: 4422 so it needs to be renamed as 4422.txt

c:\temp\2.txt may have a line like Invoice#: 5454 so it needs to be renamed as 5454.txt

and so on..

I am able to get the invoice number by Regex as

$filecontents -match "INVOICE\#: (\d+):"

The * C:\temp* folder contains a big number of txt files with different invoice numbers and PS script needs to rename all files. Thanks,

Answer 1

Try this, if it works remove the -WhatIf switch on Rename-Item :

$files = Get-ChildItem "c:\temp\*.txt"
$index = [collections.generic.list[string]]::new()

foreach($file in $files)
{
    if((Get-Content $file -Raw) -match '(?<=Invoice#:\s)\d+')
    {
        $invoiceNumber = $matches[0]
        
        if($index.contains($invoiceNumber))
        {
            Write-Warning "File with name $invoiceNumber.txt already exists. Skipping."
            continue
        }

        "Renaming {0} to $invoiceNumber.txt" -f $file.Name
        $file | Rename-Item -NewName $invoiceNumber.txt -WhatIf
        $index.Add($invoiceNumber)
    }
}