Carel Fellinger schrieb: > [...] > You see, shutdown really needs root privilege, soit. > So either you use the suid trick on /sbin/shutdown (better not, and if not > then there is no need to have shutdown (/sbin) in your path either), > or signal some process running with root privilege to call shutdown for you. > > The latter is what happens with Ctrl-Alt-Del, it triggers the keyboardhandler > to call shutdown. The keyboardhandler being a kernel process runs with root > privilege, so that works. But... > > ... there is more to this story if shutdown is called with the "-a" flag > and the file /etc/shutdown.allow exists. You see, in that case shutdown > *itself* will refuse to do its work if neither root nor one of the users > listed in /etc/shutdown.allow are actually logged-on on a virtual console. > An xterm or XDM log-on screen won't do, you really have to be logged-on. > > But even if you're logged-on, "shutdown -a" still needs to be run with root > privilege (see above), so typing it from the command line will only work > if you're root or the suid bit is set. > [...]
Hello Carel, Thank you very much again. Concerning being root or having the suid bit: Mr. Benson showed up a third solution earlier in this thread. With sudo you can specify exactly for which command(s) you want to give root privileges to mere mortals. I just did it yesterday and it works fine - and there is no suid bid set to shutdown... This is great, don't you think? Cheers, Andreas.
