[EMAIL PROTECTED] wrote:
Hi all. How can I check, within a script, to see if it is being run as root
or not? I would like it to exit with an error message if it is not running
as root. I'm looking for something that works across *nix platforms so that
my script is portable. Is there a perl function that does this or perhaps
checking the uid?
I looked at the USER in %ENV but that does not show as root when I su to
root. At least, not in FreeBSD.
perldoc perlvar
[snip]
$REAL_USER_ID
$UID
$< The real uid of this process. (Mnemonic: it's the uid you came
from, if you're running setuid.) You can change both the real
uid and the effective uid at the same time by using
POSIX::setuid().
$EFFECTIVE_USER_ID
$EUID
$> The effective uid of this process. Example:
$< = $>; # set real to effective uid
($<,$>) = ($>,$<); # swap real and effective uid
You can change both the effective uid and the real uid at the
same time by using POSIX::setuid().
(Mnemonic: it's the uid you went to, if you're running setuid.)
$< and $> can be swapped only on machines supporting
setreuid().
John
--
use Perl;
program
fulfillment
--
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
<http://learn.perl.org/> <http://learn.perl.org/first-response>
