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cpio command

Linux Set the Block Size for a SCSI Tape Device

Q. I've Debian Linux 4.0 Install on HP Server. This server has SCSI tape device. According to my tape documentation size should be 64k. How can I set the block size for a HP SCSI tape device?
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We have recently brought a new Sun Solaris UNIX server. How do I Backup data and make a recovery for the Solaris OS using tar and tape device?
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How do I use cpio command under Linux?

Q. Can you explain how do I use cpio under Linux / UNIX?

A. GNU cpio is a tool for creating and extracting archives, or copying files from one place to another. It handles a number of cpio formats as well as reading and writing tar files. cpio command works just like tar, only better.

As I said earlier, cpio works like tar but it can read input from the "find" command. This is nifty feature. For example you can find out all *.c files and backup with cpio command.# find / -name "*.c" | cpio -o --format=tar > c-file.backup.tar
# find / -iname "*.pl" | cpio -o -H tar > perl-files.tar
You can also specify file name using -F option:# find / -iname "*.pl" | cpio -o -H tar -F perl-files.tarWhere,

  • -o: Create archive
  • -F: Archive filename to use instead of standard input or output. To use a tape drive on another machine as the archive.
  • -H format: Specify file format to use.
  • -i: Restore archive

You can extract archive with the following command:# cpio -i -F perl-files.tarYou can list file inside archive i.e. list contents of the cpio file with following command:# cpio -it -F perl-files.tarYou can write archive of /home to tape (drive /dev/nst0), type the following command:# find /home | cpio -o -H tar -F /dev/nst0Restore backup using following command:# cpio -i -F /dev/nst0Backup /home dir, to remote system tape drive:# find /home | cpio -o -H tar -F user@backup.nixcraft.in:/dev/nst0 --rsh-command=/usr/bin/ssh