How to change extension from en.srt to .srt in command prompt - cmd

Question

I have a list of en.srt files in my folder. I need to convert them to .srt extension.
For example
Criminal Minds - 1x01 - Extreme Aggressor.en.srt to Criminal Minds - 1x01 - Extreme Aggressor.srt
Tried the below command and it didn't work,
ren *.en.srt *.srt
Renaming extension like ren *.srt *.srv works. (Changing all files' extensions in a folder with one command on Windows)
Would like to know if there is a workaround for this?

Answer 1

A simply though clumsy method is to rename the files twice – first remove .srt, then change .en to .srt (given that there are no other files *.en):
ren "*.en.srt" "*." & ren "*.en" "*.srt"
A more elegant solution is the one provided by user Mofi in his comment:
#for /F "eol=| delims=" %I in ('dir "*.en.srt" /B /A:-D 2^> nul') do #for %J in ("%~nI") do #ren "%~I" "%~nJ%~xI"
In a batch-file this code would look similar to this (note the necessarily doubled %-signs):
#echo off
rem // Loop through all matching files:
for /F "eol=| delims=" %%I in ('dir "*.en.srt" /B /A:-D 2^> nul') do (
rem /* There are `~`-modifiers for `for` meta-variables that allow to split file names:
rem `~n` returns the base name, so the (last) extension becomes removed;
rem `~x` returns the extension (including the leading `.`);
rem therefore, `%%~nI` is the original file name with `.srt` removed, hence
rem ending with `.en`, and `%%~xI` is the original extension `.srt`;
rem another loop is used to also split off `.en` from `%%~nI`: */
for %%J in ("%%~nI") do (
rem /* Now `%%~J` returned the same as `%%~nI`, but `%%~nJ` removes `.en`;
rem so finally, rename the file to `%%~nJ` plus the original extension `.srt`: */
ren "%%~I" "%%~nJ%%~xI"
)
)
Following the thorough thread How does the Windows RENAME command interpret wildcards? on Super User, I found out that there is a way using a single ren command:
ren "*.en.srt" "?????????????????????????????????????????.srt"
However, you need to make sure to have enough ?, namely as many as there are characters in longest matching file name without .en.srt; otherwise, file names become truncated. You can avoid truncation by replacing the same sequence of ? instead of *, so longer file names are not renamed at all:
ren "?????????????????????????????????????????.en.srt" "?????????????????????????????????????????.srt"
Anyway, this only works when the original file names do not contain any more . besides the two in .en.srt; otherwise, everything behind the first . becomes removed and (finally replaced by srt).

Answer 2

Not difficult in PowerShell to identify the files and replace the end of the filename with a regex. When you are confident that the files will be renamed correctly, remove the -WhatIf from the Move-Item command.
powershell -NoLogo -NoProfile -Command ^
"Get-ChildItem -File -Path '.' -Filter '*.en.srt' |" ^
"ForEach-Object {" ^
"Move-Item -Path $_.FullName -Destination $($_.FullName -replace 'en.srt$','srt') -WhatIf" ^
"}"
Of course, it would be easier if the command shell were PowerShell. BTW, this exact same code would work on Linux and Mac without change.
Get-ChildItem -File -Path '.' -Filter '*.en.srt' |
ForEach-Object {
Move-Item -Path $_.FullName -Destination $($_.FullName -replace 'en.srt$','srt') -WhatIf
}

Answer 3

I don't have a cmd at my disposition but I would guess that
ren *.en.srt *.tmp
ren *.tmp *.srt
works