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Full Discussion: Shell Script to Delete 1 folder and keep 5
Top Forums UNIX for Dummies Questions & Answers Shell Script to Delete 1 folder and keep 5 Post 302429389 by greendevil on Monday 14th of June 2010 10:18:20 AM
Old 06-14-2010
Shell Script to Delete 1 folder and keep 5
I have situation that I had originally thought would be easily remedied until I learned more about how -mtime actually works.

We have one server that collects backups from a number of other servers. The backup server is limited in space (for reasons that predate my employment). The standard here is to maintain 5 days worth of backup folders in each subdirectory.

Also- I should mention that this is a Windows server and I am using cygwin to run linux scripts.

For the purpose of example, here is the how the directory structure is setup;

g/backup/subdir

Within subdir, the backups directories simply have dates, so under subdir, you'd see;

2010-6-10 2010-6-11 2010-6-12 2010-6-13 2010-6-14 2010-6-15

The goal is to maintain 5 days and delete the 6th day's folder...

The script that I have setup to run against a directory like this is;
Code:
cd /cygdrive/g/backup/subdir
 
/usr/bin/find . -name "20*" -mtime -type d -execdir /usr/bin/rm -r '{}' \;

Now- here's the catch. The backup folders (2010-6-15) don't all get created at the exact same time. In fact for some, the times can vary greatly- from 7pm to 3am. This is where I think it breaks down when trying to use -mtime, since it's actually looking at the number of seconds, not the date on the folder.

I started trying to figure out a way of creating a file count variable, such as;
Code:
'dirnum=ls | wc -l'   #and then to go on and write an 'if/then' script like 
 
'if $dirnum > 5   then....'

Again, I'm stuck with trying to figure out how to delete by date.

Sorry if this post is too wordy or if I've left out info. This marks my first post in a forum as I can usually figure these things out.

If anyone has any ideas or some better direction, it would be much appreciated.

thanks.
Last edited by vbe; 06-14-2010 at 12:21 PM.. Reason: code tags please
 

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LEARN ABOUT DEBIAN

svn-fast-backup

svn-fast-backup(1)					      General Commands Manual						svn-fast-backup(1)

NAME

       svn-fast-backup - very fast backup for Subversion fsfs repositories.

SYNOPSIS

       svn-fast-backup [-q] [-k{N|all}] [-f] [-t] [-s] repos_path backup_dir

DESCRIPTION

       svn-fast-backup uses rsync snapshots for very fast backup of a Subversion fsfs repository at repos_path to backup_dir/repos-rev, the latest
       revision number in the repository.  Multiple fsfs backups share data via hardlinks, so old backups are almost free, since a newer  revision
       of a repository is almost a complete superset of an older revision.

       This  is  good for replacing incremental log-dump+restore-style backups because it is just as space-conserving and even faster; there is no
       inter-backup state (old backups are essentially caches); each backup directory is self-contained.  It has the same  command-line  interface
       as svn-hot-backup(1) (if you use --force), but only works for fsfs repositories.

       svn-fast-backup keeps 64 backups by default and deletes backups older than these; this can be adjusted with the -k option.

OPTIONS

       -h, --help
	      Shows some brief help text.

       -q, --quiet
	      Quieter-than-usual operation.

       -k, --keep=N
	      Keep a specified number of backups; the default is to keep 64.

       -k, --keep=all
	      Do not delete any old backups at all.

       -f, --force
	      Make a new backup even if one with the current revision exists.

       -t, --trace
	      Show actions.

       -s, --simulate
	      Don't perform actions.

AUTHOR

       Voluntary contributions made by many individuals.  Copyright (C) 2006 CollabNet.

								    2006-11-09							svn-fast-backup(1)
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