Archives created with the SunOS 5.8 cpio command might not be compatible with older SunOS releases. The cpio command allows you to create archives that can be read with several other formats. You specify these formats using the -H option and one of these arguments:
crc or CRC - ASCII header with checksum
ustar or USTAR - IEEE/P1003 Data Interchange
tar or TAR - tar header and format
odc - ASCII header with small device numbers
bar - bar header and format
The syntax for using the header options is:
cpio -o -H header-option < file-list > output-archive
Use the cpio command to create the archive.
$ cpio -oH odc < file-list > /dev/rmt/n
The -H values have the same meaning for input as they do for output. If the archive was created using the -H option, you must use the same option when the archive is read back in or the cpio command will fail, as shown below.
$ find . -print | cpio -oH tar > /tmp/test 113 blocks $ cpio -iH bar < /tmp/test cpio: Invalid header "bar" specified USAGE: cpio -i[bcdfkmrstuvBSV6] [-C size] [-E file] [-H hdr] [-I file [-M msg]] [-R id] [patterns] cpio -o[acvABLV] [-C size] [-H hdr] [-O file [-M msg]] cpio -p[adlmuvLV] [-R id] directory
When you create an archive using different options, always write the command syntax on the media label along with the names of the files or file system on the archive.
If you do not know which cpio options were used when an archive was created, all you can do is experiment with different combinations of the options to see which ones allow the archive to be read.
See cpio(1) for a complete list of options.
You can use only the -H bar option with -i to retrieve files. You cannot create files with the bar header option.
Change to the directory where you want to put the files.
Insert the diskette into the drive.
Run volcheck to make the diskette available.
Use the cpio command to retrieve bar files from a diskette.
All the files on the diskette are copied to the current directory.
$ cpio -ivH bar < /vol/dev/rdiskette/unlabeled