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| General software and network General OS-independent software and network questions, X11, MTA, routing, etc. |
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29th June 2011
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Running a command as a different user w/o starting the login shell
Is there a straightforward manner?
I know about su -c user, but that will try to start the login shell. If the login shell is set to /sbin/nologin (As it often is for cron/daemon users) it won't work. I actually solved this problem already using a very simple C program using setgid(), setuid(), and system(). But I find it hard to believe that I'm the first one with this issue and that this is the easiest way ...
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. 
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29th June 2011
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Wouldn't sudo(8) do this easily?
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OpenBSD LiveCDs/LiveDVDs
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29th June 2011
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Yup.
Code:
# sudo -u test ls BACKUP # grep test /etc/passwd test:*:2000:2000:test:/var/empty:/usr/sbin/nologin
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religions, worst damnation of mankind "If 386BSD had been available when I started on Linux, Linux would probably never had happened." Linus Torvalds Linux is not UNIX! Face it! It is not an insult. It is fact: GNU is a recursive acronym for “GNU's Not UNIX”. vermaden's: links resources deviantart spreadbsd
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29th June 2011
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Thanks, that works. I typically don't have sudo installed/configured though.
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UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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1st July 2011
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I probably would have tried execl() or execv()
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My Journal Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''.
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