System Administration Guide, Volume 1

Copying Directories Between File Systems (cpio Command)

You can use the cpio (copy in and out) command to copy individual files, groups of files, or complete file systems. This section describes how to use the cpio command to copy complete file systems.

The cpio command is an archiving program that copies a list of files into a single, large output file. It inserts headers between the individual files to facilitate recovery. You can use the cpio command to copy complete file systems to another slice, another system, or to a media device, such as tape or diskette.

Because the cpio command recognizes end-of-media and prompts you to insert another volume, it is the most effective command (other than ufsdump) to use to create archives that require multiple tapes or diskettes.

With cpio, you frequently use commands like ls and find to list and select the files you want to copy, piping the output to the cpio command.

How to Copy Directories Between File Systems (cpio)

  1. Become superuser.

  2. Change to the appropriate directory.

    # cd filesystem1
  3. Copy the directory tree from filesystem1 to filesystem2 by using a combination of the find and cpio commands.

    # find . -print -depth | cpio -pdm filesystem2

    Starts in the current working directory. 


    Prints the file names. 


    Descends the directory hierarchy and prints file names on the way back up. 


    Creates a list of files. 


    Creates directories as needed. 


    Sets the correct modification times on directories. 

    The files from the directory name you specify are copied and symbolic links are preserved.

    You might also specify the -u option. This option forces an unconditional copy. Otherwise older files do not replace newer files. This might be useful if you want an exact copy of a directory, and some of the files being copied might already exist in the target directory.

  4. Verify the copy was successful by displaying the destination directory contents.

    # cd filesystem2
    # ls
  5. If appropriate, remove the source directory.

    # rm -rf filesystem1

Example--Copying Directories Between File Systems (cpio)

# cd /data1
# find . -print -depth | cpio -pdm /data2
19013 blocks
# cd /data2
# ls
# rm -rf /data1

See cpio(1) for more information.