How do I use For /F in a batch file to find file types

Question

I have a batch file which uses a For /F loop to find all files with a specific (cadence backup uses <filename.ext,1> for backup) setup.

For /F "delims=" %%A in ( 'Dir /B/S "*,*" ^| findstr ",[0-9][0-9]*$" ' ) Do Del "%%A"

and this works for this special setup (This is a special search for an unusual file name format of ABCDE.ZYX,1).

How do I reuse the findstr to find all .bak files as a second search string?

Separate question:

How does this line ( 'Dir /B/S "*,*" ^| findstr ",[0-9][0-9]*$" ' ) work? What is it doing? Please explain the functions and attributes.

Answer 1

My Working Solution. Thanks to those who explained the functions involved.

@ECHO off
set cadencedeleted=0
set autodeleted=0
set altiumdeleted=0

ECHO Cadence Back-up Deletion In Progress
For /F "delims=" %%A in ( 'Dir /B/S "*,*" ^| findstr ",[0-9][0-9]*$" ' ) Do (
    Del "%%A"
    set cadencedeleted=1
)

ECHO AutoCAD Back-up Deletion In Progress
For /F "delims=" %%A in ( 'Dir /B/S "*.bak" 2^>nul ' ) Do (
    Del "%%A"
    set autodeleted=1
)
ECHO Altium Back-up Deletion In Progress
ECHO Note Altium *.pcbdoc.zip, *.schdoc.zip, *.outjob.zip, *.log,
ECHO *.prjpcb.zip, *.schlib.zip, *.pcblib.zip are the only ones deleted

For /F "delims=" %%A in ( 'Dir /B/S "*.pcbdoc.zip" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)

For /F "delims=" %%A in ( 'Dir /B/S "*.SchDoc.zip" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)

For /F "delims=" %%A in ( 'Dir /B/S "*.OutJob.zip" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)

For /F "delims=" %%A in ( 'Dir /B/S "*.log" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)

For /F "delims=" %%A in ( 'Dir /B/S "*.PcbLib.zip" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)

For /F "delims=" %%A in ( 'Dir /B/S "*.SchLib.zip" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)

For /F "delims=" %%A in ( 'Dir /B/S "*.prjpcb.zip" 2^>nul ' ) Do (
    Del "%%A"
    set altiumdeleted=1
)
ECHO Deletion checks

IF %cadencedeleted%==1 (
    ECHO Cadence backup files deleted
) ELSE (
    ECHO Cadence backup files not found
)

IF %autodeleted%==1 (
    ECHO AutoCAD backup files deleted
) ELSE (
    ECHO AutoCAD backup files not found
)

IF %altiumdeleted%==1 (
    ECHO Altium Backup files deleted
) ELSE (
    ECHO Altium Backup files not found
)

ECHO on
TIMEOUT 5