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  /J Copy using unbuffered I/O. Recommended for very large files.

/Q Do not display file names while copying.

/F Display full source and destination file names while copying.

/L List only - Display files that would be copied.

/Z Copy files in restartable mode. If the copy is interrupted part way through,

it will restart if possible. (use on slow networks)

Destination Options 

/R Overwrite read-only files.

/T Create folder structure, but do not copy files.

Do not include empty folders or subfolders.

/T /E will include empty folders and subfolders.

/K Copy attributes. XCOPY will otherwise reset read-only attributes.

/N If at all possible, use only a short filename (8.3) when creating

a destination file. This can be necessary when copying between disks

that are formatted differently e.g NTFS and VFAT, or when archiving

data to an ISO9660 CDROM.

/O Copy file Ownership and ACL information.

/X Copy file audit settings (implies /O).

XCOPY will accept UNC pathnames.

To always overwrite destination files use the COPYCMD environment variable: SET COPYCMD=/Y 

When comparing Dates/Times the granularity (the finest increment of the timestamp) is 2 seconds for a FAT volume and 0.1microsecond for an NTFS volume.

Copy a single file

In most cases copying a single file is best done with the COPY command. When copying a single file with XCOPY,there is no option to indicate if the destination is a filename or a directory (with the filename defaulting to that of the

source file).In such cases XCOPY will prompt with a (locale specific) message like:C:\> xcopy foo.txt bar.txt

Does foo.txt specify a file name

or directory name on the target

(F = file, D = directory)?

 Adding a wildcard (*) to the end of the destination will suppress this prompt and default to copying as a file:C:\> xcopy foo.txt bar.txt*

C:foo.txt

1 File(s) copied 

This requires the source and target file extensions to be the same length, typically 3 characters.

Insufficient Memory error

 Attempting to XCOPY a source file that has a pathname longer than the Windows maximum path length (254characters) will result in a rather unhelpful 'Insufficient Memory' error, the operation will then halt. This bug which hasbeen around for over 10 years makes XCOPY a poor choice for any kind of backup script, use ROBOCOPY instead.

Examples: 

Copy a file:

echo F| XCOPY C:\utils\MyFile.txt D:\Backup\CopyFile.txt 

Copy a folder:

XCOPY C:\utils D:\Backup\utils /i 

Copy a folder including all subfolders.

XCOPY C:\utils\* D:\Backup\utils /s /i 

“It is easier to copy than to think, hence fashion” ~ Wallace Stevens  

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Related: 

COPY - Copy one or more files to another locationDEL - Delete filesMOVE - Move a file from one folder to anotherROBOCOPY - Robust File and Folder CopyPowerShell: Copy-Item - Copy an item from one location to anotherEquivalent bash command (Linux): cp - Copy one or more files to another location