03-02-2018
I think your problem is that find takes the order in the directory.
In a simple file system initialy the order in the directory defaults to the order in which files are created. But if files are deleted, a new file can take the position of a deleted entry.
Not to speak of more complex file systems that use a hash table.
What is your file system type?
Perhaps you do not need to reinvent the wheel. There is ufsdump/ufsrestore for the ufs file system, and certainly another method for a zfs file system.
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CPIO(1) General Commands Manual CPIO(1)
NAME
cpio - copy files to and from archives
SYNOPSIS
cpio {-o|--create} [-0acvABLV] [-C bytes] [-H format] [-M message] [-O [[user@]host:]archive] [-F [[user@]host:]archive]
[--file=[[user@]host:]archive] [--format=format] [--message=message] [--null] [--reset-access-time] [--verbose] [--dot] [--append]
[--block-size=blocks] [--dereference] [--io-size=bytes] [--quiet] [--force-local] [--rsh-command=command] [--help] [--version] < name-list
[> archive]
cpio {-i|--extract} [-bcdfmnrtsuvBSV] [-C bytes] [-E file] [-H format] [-M message] [-R [user][:.][group]] [-I [[user@]host:]archive] [-F
[[user@]host:]archive] [--file=[[user@]host:]archive] [--make-directories] [--nonmatching] [--preserve-modification-time] [--numeric-uid-
gid] [--rename] [-t|--list] [--swap-bytes] [--swap] [--dot] [--unconditional] [--verbose] [--block-size=blocks] [--swap-halfwords] [--io-
size=bytes] [--pattern-file=file] [--format=format] [--owner=[user][:.][group]] [--no-preserve-owner] [--message=message] [--force-local]
[--no-absolute-filenames] [--sparse] [--only-verify-crc] [--to-stdout] [--quiet] [--rsh-command=command] [--help] [--version] [pattern...]
[< archive]
cpio {-p|--pass-through} [-0adlmuvLV] [-R [user][:.][group]] [--null] [--reset-access-time] [--make-directories] [--link] [--quiet] [--pre-
serve-modification-time] [--unconditional] [--verbose] [--dot] [--dereference] [--owner=[user][:.][group]] [--no-preserve-owner] [--sparse]
[--help] [--version] destination-directory < name-list
REPORTING BUGS
Report cpio bugs to bug-cpio@gnu.org
GNU cpio home page: <http://www.gnu.org/software/cpio/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report cpio translation bugs to <http://translationproject.org/team/>
SEE ALSO
cpio(5)
DESCRIPTION
GNU cpio is fully documented in the texinfo documentation. To access the help from your command line, type
info cpio
The online copy of the documentation is available at the following address:
http://www.gnu.org/software/cpio/manual
CPIO(1)