If /y is preset in the COPYCMD environment variable, you can override this setting by using /-y at the command line. By default, you are prompted when you replace this setting, unless the copy command is executed in a batch script.

If you combine files, the copy command marks the destination file with the current date and time. If you omit destination, the files are combined and stored under the name of the first file in the list.

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If the connection is lost during the copy phase (for example, if the server going offline breaks the connection), you can use copy /z to resume after the connection is re-established. The /z option also displays the percentage of the copy operation that is completed for each file.

If you don't specify a destination file, a copy is created with the same name, modified date, and modified time as the original file. The new copy is stored in the current directory on the current drive. If the source file is on the current drive and in the current directory and you do not specify a different drive or directory for the destination file, the copy command stops and displays the following error message:

To copy a file named robin.typ from the current drive and directory to an existing directory named Birds that is located on drive C, type:

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The effect of /b depends on its position in the command–line string: - If /b follows source, the copy command copies the entire file, including any end-of-file character (CTRL+Z). - If /b follows destination, the copy command doesn't add an end-of-file character (CTRL+Z).

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The effect of /a depends on its position in the command-line string: - If /a follows source, the copy command treats the file as an ASCII file and copies data that precedes the first end-of-file character (CTRL+Z). - If /a follows destination, the copy command adds an end-of-file character (CTRL+Z) as the last character of the file.

To combine all files in the current directory that have the .txt file name extension into a single file named Combined.doc, type:

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If you specify more than one file in source, the copy command combines them all into a single file using the file name specified in destination. The copy command assumes the combined files are ASCII files unless you use the /b option.

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To combine Mar89.rpt, Apr89.rpt, and May89.rpt, which are located in the current directory, and place them in a file named Report (also in the current directory), type:

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To append files, specify a single file for destination, but multiple files for source (use wildcard characters or file1+file2+file3 format).

If a write operation cannot be verified, an error message appears. Although recording errors rarely occur with the copy command , you can use /v to verify that critical data has been correctly recorded. The /v command-line option also slows down the copy command, because each sector recorded on the disk must be checked.

If /b directs the command interpreter to read the number of bytes specified by the file size in the directory. /b is the default value for copy, unless copy combines files.

If /b precedes or follows a list of files on the command line, it applies to all listed files until copy encounters /a. In this case, /a applies to the file preceding /a.

To combine all files with the .txt extension, and then to combine all files with the .ref extension into one file named Combined.doc, type:

To copy a file called memo.doc to letter.doc in the current drive and ensure that an end-of-file character (CTRL+Z) is at the end of the copied file, type:

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If the Birds directory doesn't exist, the file robin.typ is copied into a file named Birds that is located in the root directory on the disk in drive C.

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You can also use the copy command, with different parameters, from the Recovery Console. For more information about the recovery console, see Windows Recovery Environment (Windows RE).

If destination is a device (for example, Com1 or Lpt1), the /b option copies data to the device in binary mode. In binary mode, copy /b copies all characters (including special characters such as CTRL+C, CTRL+S, CTRL+Z, and ENTER) to the device, as data. However, if you omit /b, the data is copied to the device in ASCII mode. In ASCII mode, special characters might cause files to combine during the copying process.

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To combine several binary files into one file by using wildcard characters, include /b. This prevents Windows from treating CTRL+Z as an end-of-file character. For example, type:

If /a precedes or follows a list of files on the command line, it applies to all files listed until copy encounters /b. In this case, /b applies to the file preceding /b.