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Copies files and directory trees.

XCOPY source [destination] [/A | /M] [/D[:date]] [/P] [/S [/E]] [/V] [/W]
[/C] [/I] [/Q] [/F] [/L] [/H] [/R] [/T] [/U]
[/K] [/N] [/O] [/X] [/Y] [/-Y] [/Z]

source       Specifies the file(s) to copy.
destination  Specifies the location and/or name of new files.
/A           Copies only files with the archive attribute set

doesn't change the attribute.
/M           Copies only files with the archive attribute set

turns off the archive attribute.
/D:m-d-y     Copies files changed on or after the specified date.
If no date is given
copies only those files whose
source time is newer than the destination time.
Specifies a list of files containing strings.  When any of the
strings match any part of the absolute path of the file to be
that file will be excluded from being copied.  For
specifying a string like \obj\ or .obj will exclude
all files underneath the directory obj or all files with the
.obj extension respectively.
/P           Prompts you before creating each destination file.
/S           Copies directories and subdirectories except empty ones.
/E           Copies directories and subdirectories
including empty ones.
Same as /S /E. May be used to modify /T.
/V           Verifies each new file.
/W           Prompts you to press a key before copying.
/C           Continues copying even if errors occur.
/I           If destination does not exist and copying more than one file

assumes that destination must be a directory.
/Q           Does not display file names while copying.
/F           Displays full source and destination file names while copying.
/L           Displays files that would be copied.
/H           Copies hidden and system files also.
/R           Overwrites read-only files.
/T           Creates directory structure
but does not copy files. Does not
include empty directories or subdirectories. /T /E includes
empty directories and subdirectories.
/U           Copies only files that already exist in destination.
/K           Copies attributes. Normal Xcopy will reset read-only attributes.
/N           Copies using the generated short names.
/O           Copies file ownership and ACL information.
/X           Copies file audit settings (implies /O).
/Y           Suppresses prompting to confirm you want to overwrite an
existing destination file.
/-Y          Causes prompting to confirm you want to overwrite an
existing destination file.
/Z           Copies networked files in restartable mode.

The switch /Y may be preset in the COPYCMD environment variable.
This may be overridden with /-Y on the command line.