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Top Forums Shell Programming and Scripting Rename File Based on Created Date Post 302373750 by jlliagre on Saturday 21st of November 2009 08:12:11 PM
Old 11-21-2009
Quote:
Originally Posted by Paulb
I am trying to rename files based on the created/born date of the file.
The short answer is you can't reliably.
The large majority of file systems do not store file creation dates so there is no way to know when a file was created unless that information is included in the file itself (ex: exif photos). The few file systems I know actually storing the file creation time are BSD/UFS2/st_birthtime, Solaris/ZFS/crtime, Mac OS/HSF+/btime and Linux/Ext4/crtime.
With the other ones, the only timestamps recorded in a file metadata are the last modification and the last access time.
However, if the files you are processing are never modified after their initial creation, the last modification should be pretty close to the creation time (depending on the time spent to write the file), which is what the scripts suggested are doing.

Last edited by jlliagre; 11-21-2009 at 09:34 PM..
 

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UUID_TIME(3)							    Libuuid API 						      UUID_TIME(3)

NAME
uuid_time - extract the time at which the UUID was created SYNOPSIS
#include <uuid.h> time_t uuid_time(uuid_t uu, struct timeval *ret_tv) DESCRIPTION
The uuid_time function extracts the time at which the supplied time-based UUID uu was created. Note that the UUID creation time is only encoded within certain types of UUIDs. This function can only reasonably expect to extract the creation time for UUIDs created with the uuid_generate_time(3) and uuid_generate_time_safe(3) functions. It may or may not work with UUIDs created by other mechanisms. RETURN VALUES
The time at which the UUID was created, in seconds since January 1, 1970 GMT (the epoch), is returned (see time(2)). The time at which the UUID was created, in seconds and microseconds since the epoch, is also stored in the location pointed to by ret_tv (see gettimeofday(2)). AUTHOR
Theodore Y. Ts'o AVAILABILITY
libuuid is part of the util-linux package since version 2.15.1 and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. SEE ALSO
uuid(3), uuid_clear(3), uuid_compare(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3) util-linux May 2009 UUID_TIME(3)
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