Re: Maintenance Scripts

[John Haxby <jch@xxxxxxxxxxxxxxxxxx>]

Thom Paine wrote:

>                                                                 
> # Find and delete temp files
> cd /home
> find -name *.tmp -exec rm -f {} \;
> find -name *.TMP -exec rm -f {} \;
> find -name *.bak -exec rm -f {} \;
>                             
This is going to annoy people.   If I create a file called something.bak 
and then go home it'll get deleted during the night.    Actually, 
removing what you think might be temporary files is a Bad Thing(TM) 
anyway, it's better to let users do it themselves.    If you're still 
sure you want to go ahead, do something like this:

   find -type f -atime +3 \( -iname '*.tmp' -o -iname '*.bak' -o -iname 
'*~' \) -print0 | xargs -0 rm -f

(you might have to join lines together).   This deletes likely looking 
files, and only files, that haven't been read in the last three days 
(mtime is the wrong argument, think about it).  The "-print0" and "-0" 
make sure that filenames with spaces, newlines, whatever don't cause 
problems.

>                                                   
> # Report each users home folder size
>                                                                                
> cd /home
> du -c -h --max-depth=1 > /root/homesize.txt
I would think that

   du -s | sort -nr > /root/homesize

(I hate those windows extensions) would be better because it'll put the 
biggest users at the home and only report the home directories.   "-h" 
is nice for readability, but not so good for postprocessing.   Anyway, a 
huge number next to your name at the top of the list is likely to be an 
embarrasment!  (Not that it's ever happened to me you understand :-))   
Of course, there's no reason to send the output anywhere, if you don't 
(and it's in a cron job) then the whole lot will be mailed to you -- so 
you could do this:

   echo
   echo DISK USAGE
   echo ==========
   du -s /home/* | sort -nr

If you're trying to control disk space, however, you might want to look 
at imposing quotas.   Having a quota is a really good incentive to clear 
up your own temporary files and whatnot.   There's also the advantage 
that since the filesystem maintains the usage structures getting a 
summary is very fast.   Bear in mind though that you really want to 
over-subscribe the amount of disk space (hotels and airlines know all 
about this and it really does make sense, I think I used to 
over-subscribe by 10-25% when I enforced quotas on   the 200Mb /home we 
had then).

> # Disk Free List
> df -h > /root/diskfree.txt
>  
I find it amazingly difficult to run my eye down a list of different 
units and compare them.



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