I've tried sudo and it worked. I can now do the thing I need with it. Thanks again Keith for all your helpful suggestions.
Well, one more thing is that, I would like to verify if a password provided by the user is correct. Is there a shell command for this? I'm not attempting write my own authentication module (with PAM or whatsoever); I'd like know if it can be done with a certain shell command, which would just say if a given password is correct for a given user.
If it's not possible with a shell command, may I further ask if it can be done in a programming language like C, Perl, PHP,...?
I am not sure what you are trying to do with verifying a password. If you mean against the shadow password file, then su does that, but it also changes your effective UID/GID. There are PAM APIs for checking for a valid password in many languages, but I haven't needed to code one so I can't post an example.
Best Regards, Keith -- LPIC-2, MCSE, N+ Droplets of yes and no in an ocean of maybe Got spam? Get spastic http://spastic.sourceforge.net
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