Batch file to delete files with .bak extension

Question

In batch, I want to delete all files *.bak in various folders on disk c:\\.
Can anyone help me?

ex.:

all c:
del *.bak /s /a

Answer 1

It can be a single command.

del /s /q /f c:\*.bak

Answer 2

Be extremely careful doing global deletes! You may get more than you ask for, especially in the way of headaches and lost time restoring your system.

With that being said:

C:
cd \
del /s /q /f *.bak

For more information, type del /? from the command prompt, which gives you this in Windows 7:

Deletes one or more files.

DEL [/P] [/F] [/S] [/Q] [/A[[:]attributes]] names
ERASE [/P] [/F] [/S] [/Q] [/A[[:]attributes]] names

  names         Specifies a list of one or more files or directories.
                Wildcards may be used to delete multiple files. If a
                directory is specified, all files within the directory
                will be deleted.

  /P            Prompts for confirmation before deleting each file.
  /F            Force deleting of read-only files.
  /S            Delete specified files from all subdirectories.
  /Q            Quiet mode, do not ask if ok to delete on global wildcard
  /A            Selects files to delete based on attributes
  attributes    R  Read-only files            S  System files
                H  Hidden files               A  Files ready for archiving
                I  Not content indexed Files  L  Reparse Points
                -  Prefix meaning not

If Command Extensions are enabled DEL and ERASE change as follows:

The display semantics of the /S switch are reversed in that it shows
you only the files that are deleted, not the ones it could not find.