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Full Discussion: comparing time stamps
Top Forums Shell Programming and Scripting comparing time stamps Post 302336048 by RSC1985 on Tuesday 21st of July 2009 05:27:48 AM
Old 07-21-2009
comparing time stamps

Hello All,

I'm generating timestamps (file creation timestamps) for all the files in a directory. I need to compare all the timestamps.
for example if i have 4 files and their timestamps are 20091125114556,
20091125114556,20091125114556,20091125114556 respectively.

I need to differentiate atleast secs portion to recognize the file. So what i'm going to do is if all timestamps are same then i will modify seconds portion. But my question here is how to compare these timestamps respect to their corresponding files.?

Please suggest a way but not the solution.

Thanks in advance,
RSC1985
 

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SD_JOURNAL_GET_CUTOFF_REALTIME_USEC(3)			sd_journal_get_cutoff_realtime_usec		    SD_JOURNAL_GET_CUTOFF_REALTIME_USEC(3)

NAME
sd_journal_get_cutoff_realtime_usec, sd_journal_get_cutoff_monotonic_usec - Read cut-off timestamps from the current journal entry SYNOPSIS
#include <systemd/sd-journal.h> int sd_journal_get_cutoff_realtime_usec(sd_journal* j, uint64_t* from, uint64_t* to); int sd_journal_get_cutoff_monotonic_usec(sd_journal* j, sd_id128_t boot_id, uint64_t* from, uint64_t* to); DESCRIPTION
sd_journal_get_cutoff_realtime_usec() gets the realtime (wallclock) timestamps of the first and last entries accessible in the journal. It takes three arguments: the journal context object and two pointers to 64-bit unsigned integers to store the timestamps in. The timestamps are in microseconds since the epoch, i.e. CLOCK_REALTIME. Either one of the two timestamp arguments may be passed as NULL in case the timestamp is not needed, but not both. sd_journal_get_cutoff_monotonic_usec() gets the monotonic timestamps of the first and last entries accessible in the journal. It takes three arguments: the journal context object, a 128-bit identifier for the boot, and two pointers to 64-bit unsigned integers to store the timestamps. The timestamps are in microseconds since boot-up of the specific boot, i.e. CLOCK_MONOTONIC. Since the monotonic clock begins new with every reboot it only defines a well-defined point in time when used together with an identifier identifying the boot, see sd_id128_get_boot(3) for more information. The function will return the timestamps for the boot identified by the passed boot ID. Either one of the two timestamp arguments may be passed as NULL in case the timestamp is not needed, but not both. RETURN VALUE
sd_journal_get_cutoff_realtime_usec() and sd_journal_get_cutoff_monotonic_usec() return 1 on success, 0 if not suitable entries are in the journal or a negative errno-style error code. NOTES
The sd_journal_get_cutoff_realtime_usec() and sd_journal_get_cutoff_monotonic_usec() interfaces are available as a shared library, which can be compiled and linked to with the libsystemd-journal pkg-config(1) file. SEE ALSO
systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_get_realtime_usec(3), sd_id128_get_boot(3), clock_gettime(2) systemd 208 SD_JOURNAL_GET_CUTOFF_REALTIME_USEC(3)
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