Re: [gentoo-server] simple shell script

[Christian Bricart]

Ben Munat schrieb:
> Argh. I've been trying to come up with what should be a simple bash
> script, but I just can't seem to get it right.
>
> I'm trying to fix up my cron script that runs sa-learn. I want it to
> check to see if there's actually any mails in the directory before
> running "sa-learn <my options> <my missed spam dir>" and then "rm <my
> missed spam dir>/*".

Actually, this is not a valid answer to your question - but as in the 
"Hitchhkers Guide through the Galaxy": "Maybe your question has been all 
wrong" ;-)

Why do you want to check if the directioy is empty at all? Just call 
"sa-learn" either in loop on every file in the directory. If it's emty 
it's not executed at all.
On the other hand, you can call "sa-learn" on an empty directory and 
you'll get "Learned from 0 messages".

find /the/path/to/your/directory/ -type f -print0 | xargs -0 \
sa-learn <your options>
>
> I've gone in circles with using the "-e" test ("if [ -e $mydir'/*' ]")
> and just command success ("if `ls $mydirwithslashstar`", etc.) and I
> can't seem to get it right. What's the simplest way to just test if a
> directory is empty?

that would be something like:

if [ `ls -l /path/to/directory | wc -l` -eq 0 ]; then
...
fi

(not tested though)

Christian

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