DBCP
1
BRL-CAD
BRL-CAD

# dbcp

double buffered copy

      dbcp
        -v
        blocksize
        <
        infile
        >
        outfile

## DESCRIPTION

`dbcp` is a program for copying data rapidly between devices.

This command is DEPRECATED. Use 'dd' instead.

While the primary application is to move data between raw devices such as tape and disk, it can also be used with pipes. No special support is required from the operating system; `dbcp` forks into two processes which communicate over a pair of regular pipes using a token passing scheme to synchronize their reading and writing activities. They continue copying until an end of file or error is detected. `dbcp` reads from the standard input and copies to the standard output. The argument blocksize specifies the number of 512 byte "blocks" to be read or written in each record.

If the `-v` flag is given, the number of records processed is printed upon exit.

## EXAMPLES

$ dbcp 16 < /dev/rdk1a > /dev/rmt0 `dbcp` copies the filesystem on dk1a to tape with a record size of 8K bytes (16 * 512). This allows "streaming" tape drives to operate a peak speed.

$ tar cf - . | dbcp 20 > /dev/rmt0 The tar process runs independently of the `dbcp`, which rapidly copies the data to tape with the usual tar tape record size of 10K bytes (20 * 512).

## SEE ALSO

cp 1, dd 1

## AUTHOR

Douglas P. Kingston III (Davis, Polk, and Wardwell, Chase Manhattan Building, New York, NY)

## COPYRIGHT

This software is Copyright (c) 1993-2013 by the United States Government as represented by U.S. Army Research Laboratory.

## BUG REPORTS

Reports of bugs or problems should be submitted via electronic mail to <devs@brlcad.org>.