11-17-2010
This is possibly the most obfuscaded code I have ever seen.
I think this needs a "sed" expert (not me).
As far as I can see the script is creating a cpio archive of a file to a pipeline, displaying the archive in formatted hexadecimal (the "od -x") then fishing the formatted file modifiction date out of the archive and then converting that date from hexadecimal to decimal. I could be wrong.
On my system the cpio header structure is described in "man 4 cpio".
The approach is interesting but a "tar" archive format might have been easier to work with.
There are much better methods depending on what Operating System you have.
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cpio.h(3HEAD) Headers cpio.h(3HEAD)
NAME
cpio.h, cpio - cpio archive values
SYNOPSIS
#include <cpio.h>
DESCRIPTION
Values needed by the c_mode field of the cpio archive format are described as follows:
Name Description
C_IRUSR Read by owner
C_IWUSR Write by owner
C_IXUSR Execute by owner
C_IRGRP Read by group
C_IWGRP Write by group
C_IXGRP Execute by group
C_IROTH Read by others
C_IWOTH Write by others
C_IXOTH Execute by others
C_ISUID Set user ID
C_ISGID Set group ID
C_ISVTX On directories, restricted deletion flag
C_ISDIR Directory
C_ISFIFO FIFO
C_ISREG Regular file
C_ISBLK Block special
C_ISCHR Character special
C_ISCTG Reserved
C_ISLNK Symbolic link
C_ISSOCK Socket
The header defines the symbolic constant:
MAGIC "070707"
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
pax(1), attributes(5), standards(5)
SunOS 5.10 10 Sep 2004 cpio.h(3HEAD)