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Full Discussion: Purge files, keep 3 versions of last 4 days
Top Forums Shell Programming and Scripting Purge files, keep 3 versions of last 4 days Post 30838 by Perderabo on Monday 28th of October 2002 02:39:52 PM
Old 10-28-2002
She wants to lose the 7:00pm and the 7:15pm files while keeping the 7:30pm amd the 7:45pm files. So just looking at the hour isn't going to fly.

If everything is absolutely guaranteed to be as she described, at the end of the day we will have exactly 61 files. If we list them from newest to oldest, we get:
1-3 last 3 files from day n
4-49 46 unwanted files from day n
49-51 3 files from day n-1
52-54 3 files from day n-2
55-47 3 files from day n-3
58-61 3 unwanted files from day n-4

If it's that easy, this is a one liner:
rm `ls -t | sed -n "4,46p;58,61p"`

I think this is a dangerous solution though. If the system goes down for a while, the numbering is off. That's why saving the files in another directory is attractive, we then don't need to delete files from the middle of a list. And simply keeping the last 3 files in a directory is very simple.
 

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LEARN ABOUT DEBIAN

timetrans

TIMETRANS(1p)						User Contributed Perl Documentation					     TIMETRANS(1p)

NAME

       timetrans - Converts time into time

SYNOPSIS

	 timetrans [units-options] [-count]

DESCRIPTION

       timetrans converts time from one type of unit to another.  If any of the units options are specified, then timetrans will convert those
       time units into the number of seconds to which they add up.  If given the count option, timetrans will convert that number of seconds into
       the appropriate number of weeks, days, hours, minutes, and seconds.  The converted result is printed out.  Units options cannot be
       specified in the same execution as the count option, and vice versa.

       timetrans is intended for use with DNSSEC-Tools, for calculating a zone's expiration time.

OPTIONS

   Units Options
       The converted value of each unit is totaled and a single result printed.

       -seconds seconds
	   Count of seconds to convert to seconds.

       -minutes minutes
	   Count of minutes to convert to seconds.

       -hours hours
	   Count of hours to convert to seconds.

       -days days
	   Count of days to convert to seconds.

       -weeks weeks
	   Count of weeks to convert to seconds.

   Count Option
       The specified seconds count is converted to the appropriate number of weeks, days, hours, minutes, and seconds.

       -count seconds
	   Count of seconds to convert to the appropriate set of units.

   Other Options
       timetrans has the following miscellaneous options.

       -Version
	   Displays the version information for timetrans and the DNSSEC-Tools package.

EXAMPLES

       Example 1:  Converting 5 days into seconds

	   $(42)> timetrans -days 5
	   432000

       Example 2:  Converting 2 weeks into seconds

	   $(43)> timetrans -w 2
	   1209600

       Example 3:  Converting 8 days and 8 hours into seconds

	   $(44)> timetrans -d 8 -hours 8
	   720000

       Example 4:  Converting 1 week, 1 day, and 8 hours into seconds

	   $(46)> timetrans -w 1 -days 1 -h 8
	   720000

       Example 5:  Converting 14 weeks, 4 days, 21 hours, 8 minutes, and 8 seconds into seconds

	   $(47)> timetrans -w 14 -d 4 -h 21 -m 8 -s 8
	   8888888

       Example 6:  Converting 720000 seconds into time units

	   $(48)> timetrans -c 720000
	   1 week, 1 day, 8 hours

       Example 7:  Converting 1814421 seconds into time units

	   $(49)> timetrans -c 1814421
	   3 weeks, 21 seconds

       Example 8:  Converting 8888888 seconds into time units

	   $(50)> timetrans -c 8888888
	   14 weeks, 4 days, 21 hours, 8 minutes, 8 seconds

COPYRIGHT

       Copyright 2004-2012 SPARTA, Inc.  All rights reserved.  See the COPYING file included with the DNSSEC-Tools package for details.

AUTHOR

       Wayne Morrison, tewok@tislabs.com

SEE ALSO

       zonesigner(8)

       Net::DNS::SEC::Tools::timetrans.pm(3)

perl v5.14.2							    2012-06-21							     TIMETRANS(1p)
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