I have a list of files in a directory.



AA_001_ABC.gif
AA_005_QRZ.gif
AA_302_LMU.gif

I want to renumber the files sequentially without modifying any other
part of the filename.

In Powershell, how would I search within the filename for a 3 digit #
(regex) and then replace just the number within the filename with a
value from an iteration (I=1, ++i)

End Result:

AA_001_ABC.gif
AA_002_QRZ.gif
AA_003_LMU.gif

Thanks.

On Oct 24, 2:20 pm, Barry S. <b...@xxxxxx> wrote:

> I have a list of files in a directory.
>
> AA_001_ABC.gif
> AA_005_QRZ.gif
> AA_302_LMU.gif
>
> I want to renumber the files sequentially without modifying any other
> part of the filename.
>
> In Powershell, how would I search within the filename for a 3 digit #
> (regex) and then replace just the number within the filename with a
> value from an iteration (I=1, ++i)
>
> End Result:
>
> AA_001_ABC.gif
> AA_002_QRZ.gif
> AA_003_LMU.gif
>
> Thanks.

The following will rename all the files starting with "AA_" and ending
with ".gif":

$number = 1

Get-ChildItem AA_*.gif | Foreach-Object {
Rename-Item $_.FullName `
( $_.Name -replace "\d{3}", ( "{0:000}" -f $number++ ) ) -
WhatIf
}

I put the -WhatIf switch on the end of the Rename-Item call so you can
make sure this will do what you want it to do.

Jeff

"Jeff" <jeff.hillman@xxxxxx> wrote in message
news:1193213125.565389.64500@xxxxxx

> $number = 1
>
> Get-ChildItem AA_*.gif | Foreach-Object {
> Rename-Item $_.FullName `
> ( $_.Name -replace "\d{3}", ( "{0:000}" -f $number++ ) ) -
> WhatIf
> }

With the approach above, the Foreach-Object isn't needed:

PS> $number = 1
PS> Get-ChildItem AA_*.gif | Rename-Item -newName {$_.Name -replace '\d{3}',
("{0:000}" -f $global:number++)} -whatif

However I would probably do it in a one-liner using foreach like so:

PS> Get-ChildItem AA_*.gif | Foreach {$num=1}{rename-item $_
($_.Name -replace '\d{3}', ("{0:000}" -f $num++)) -whatif}

Here Foreach is used to create sort of a dynamic cmdlet with a Begin and
Process scriptblock. Begin (the first scriptblock) initializes the $num
variable and Process (the second scriptblock) renames each file.

--
Keith

I learn something every day I read here. Thanks!

--
Charlie.
http://msmvps.com/xperts64
http://mvp.support.microsoft.com/profile/charlie.russel


"Keith Hill [MVP]" <r_keith_hill@xxxxxx_no_spam_I> wrote in message
news:A7452729-DFC0-432D-85B6-D4FCBF2EFD4C@xxxxxx

> "Jeff" <jeff.hillman@xxxxxx> wrote in message
> news:1193213125.565389.64500@xxxxxx

>> $number = 1
>>
>> Get-ChildItem AA_*.gif | Foreach-Object {
>> Rename-Item $_.FullName `
>> ( $_.Name -replace "\d{3}", ( "{0:000}" -f $number++ ) ) -
>> WhatIf
>> }

>
> With the approach above, the Foreach-Object isn't needed:
>
> PS> $number = 1
> PS> Get-ChildItem AA_*.gif | Rename-Item -newName {$_.Name -replace
> '\d{3}', ("{0:000}" -f $global:number++)} -whatif
>
> However I would probably do it in a one-liner using foreach like so:
>
> PS> Get-ChildItem AA_*.gif | Foreach {$num=1}{rename-item $_
> ($_.Name -replace '\d{3}', ("{0:000}" -f $num++)) -whatif}
>
> Here Foreach is used to create sort of a dynamic cmdlet with a Begin and
> Process scriptblock. Begin (the first scriptblock) initializes the $num
> variable and Process (the second scriptblock) renames each file.
>
> --
> Keith