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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 OSF1

rmm

rmm(1)							      General Commands Manual							    rmm(1)

NAME

       rmm - remove messages (only available within the message handling system, mh)

SYNOPSIS

       rmm [+folder] [msgs] [-help]

OPTIONS

       Prints a list of the valid options to this command.

       The default settings for this command are:

       +folder defaults to the current folder msgs defaults to the current message

DESCRIPTION

       The rmm command deletes the current message from the current folder.

       You can specify messages and folders other than the current ones by using the +folder and msgs arguments.

       The current message is not changed by rmm, so a next will advance to the next message in the folder as expected.

       If you have defined a component rmmproc: in your file, then instead of simply renaming the message file, rmm will call the named program to
       delete the file.

       The rmm command removes messages by renaming the message files with a preceding comma. Many sites consider files that start with a comma to
       be a temporary backup, and arrange for cron(8) to remove such files once a day.

PROFILE COMPONENTS

       Path: To determine your Mail directory

       rmmproc: Program to delete the message

FILES

       The user profile.

SEE ALSO

       rmf(1)

																	    rmm(1)
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