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Top Forums Shell Programming and Scripting Building a better mouse trap, or How many lines of code does it take to trap a mouse? Post 302070681 by mph on Thursday 6th of April 2006 03:04:40 PM
Old 04-06-2006

Not sure that I understand. Is this one directory or a directory tree? How the the files get removed? Anyway...
This is a directory tree /ftp. Under this there are the users and their incoming and outgoing directories. Each user has their own directory for security reasons. Our customers don't want their data availible to the wrong vendors.
Files get removed by another daily cron job that finds files older than 10 days. The date can't be trusted as far as how many minutes old they are. So, find works fine for removing old the files. If they're transferred via CIFS it holds the creation date previous to the transfer. That's why I use the -cmin. It seems to work well and uses the access time of the transfer. But I think that's where some files fall through. I had to setup ntp on the server due to clock variations between the server and the clients causing problems with file times. Another reason to use the "find all files and diff them" logic.
I would loop through all the files getting name and size (if date cannot be trusted, ignore it). Add name and size to a little database somewhere, timestamping this addition. Or if the entry is present, update size and timestamp. Then loop through database and find entries with old timestamps; process these; remove from database and directory (removal not possible? --- mark as processed in the database.)
This is simular to what (I guess) I was trying to say with the idea I was looking into. That is to say, find all the files under /ftp/*/outgoing and diff them for additions against the file list built 5 minutes ago. Using the diffed file names, the "database" would simply be a temp file containing the name and size. Grep for the file, awk the $NF for the size and compair till they're the same, sleeping for bit between checks to avoid frantic looping. When the run is finished delete the temp database. Removed files won't be an issue, since I'm only looking for added files between runs. If the file reapears, there's usually a good reason for it (corrupted IGES files, etc...) and the vendor should be re-notified.

I hope this makes sense. My fingers are too well connected to my brain.
Test Your Knowledge in Computers #946
Difficulty: Medium
A ping flood attack is a simple DOS attack where the attacker overwhelms the victim with TCP echo request packets.
True or False?

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APPROX-GC(8)						      System Manager's Manual						      APPROX-GC(8)

approx-gc - garbage-collect the cache of Debian archive files SYNOPSIS
approx-gc scans the cache created by approx(8) and finds files that are corrupted or no longer needed. With no options specified, these files are listed on standard output and removed from the cache. A corrupted file is one whose size or checksum does not match the value specified in the Packages or Sources file. An unneeded file is one that is not referenced from any distribution's Packages or Sources file. approx-gc may take several minutes to finish. OPTIONS
-c file, --config file Specify an additional configuration file. May be used multiple times. -f, --fast Don't perform checksum validation. -k, --keep, -s, --simulate Don't remove files from the cache. -q, --quiet Don't print file names. -v, --verbose Print the reason for removal of each file. EXAMPLES
To remove all unneeded or corrupted files from the cache: approx-gc --quiet This is run as a weekly cron(8) job. To list the files that would be removed from the cache, without actually doing so: approx-gc --keep FILES
/etc/approx/approx.conf Configuration file for approx and related programs. /var/cache/approx Default cache directory for archive files. SEE ALSO
approx.conf(5), approx(8), cron(8) AUTHOR
Eric Cooper <> May 2011 APPROX-GC(8)

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