使用Windows REN将文本插入文件名，并保持名称的其余部分？

Question

I'm currently trying to use the REN command to add text in the middle of a filename, while maintaining the rest of the filename.

Example:

testfile_2018-11-14-06-06-23.pdf -> testfile_ABCD_2018-11-14-06-06-23.pdf

The last six digits are subject to change, so I need to represent them with wildcards.

Currently, I have the following:

REN testfile_2018-11-14*.pdf testfile_ABCD_2018-11-14*.pdf

Result is: testfile_ABCD_2018-11-146-23.pdf

The last six digits are not being maintained, and I cannot figure out why.

Answer 1

Pretty sure it cannot be done with a simple REN command. You can however use the power of the FOR /F command to manipulate the file name.

From the command prompt you can run this.

for /f "tokens=1* delims=_" %G IN ('dir /a-d /b "testfile_2018-11-14*.pdf"') do ren "%G_%H" "%G_ABCD_%H"

This finds the file and then splits the file name by the underscore. It then renames it with the extra string in the new file name.

If you are going to run this in a batch file you must double the percent symbols.

Answer 2

If we're offering alternative solutions to REN, here are a few ways in PowerShell:

String Splitting:

## Get a System.IO.FileInfo object to the file
$f = Get-Item path-to-the-testfile

## Split up the name by the underscore so the zeroth entry is 'testfile' and the first entry is the remaining name
$s = $f.Name.Split("_")

## Use String tokenization to recombine the different parts in the desired order during the rename
Rename-Item $f.FullName ("{0}\{1}_{2}_{3}" -f $f.DirectoryName, $s[0], 'ABCD', $s[1])

String Replace:

## Get a System.IO.FileInfo object to the file
$f = Get-Item path-to-the-testfile

## Use string replace to fix the name during the rename operation
Rename-Item $f.FullName ($f.FullName.Replace('testfile_', 'testfile_ABCD_'))

Using regex is possible but is probably overly complicated if you're not familiar with the above methods.