On Thursday 30 Oct 2003 5:11 pm, Yannick Warnier wrote:
> Le jeu 30/10/2003 à 17:56, Gary Stainburn a écrit :
> > You can write $0 as well as reading it, which will change what appears
> > when you run ps etc.
> >
> > This can be usefull for security reasons such as hiding sensitive data
> > passed on the command line, and also for returning status information for
> > daemons.
>
> How? Could you explain that for me?
>
> Thanks,
> Yannick
security
if you have the script:
mylogon -u username -p password
and someone (doesn't have to be root) runs
ps ax
they will see the command line that started the process, including your
username and password.
by having the command
$0='mylogon -u xxxx -p xxxx';
near the top of your script the data is hidden from prying eyes.
For the daemon use, I have things like
while (1) {
$0='mydaemon - sleeping';
$in=<PIPEHANDLE>;
$0='parsing request';
etc.
--
Gary Stainburn
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