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Old 03-20-2007, 05:09 PM   #1
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Thumbs up Launch a script as it belongs to another user

Hi folks,

I hope you can point me out in the right direction. I think the subject is quite explicit but let me explain you a little bit more.
When I log in as user A for example I'd like to launch a script as it was launched by other user, for example user B, so when I execute ps command I'd like to see that the process belong to user B and not to A. All this done with a command from the shell, for sure it's possible but I donīt know the way to do it. I have checked the "man" for some commands but without success.

Thanks in advance for your comments.

Old 03-20-2007, 05:12 PM   #2
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You'd need to use the su command
su -userb <command>
Old 03-21-2007, 12:09 AM   #3
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Though su is the standard answer, I suggest checking out sudo as an alternative.
Old 03-21-2007, 04:48 AM   #4
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sorry for the delay, I've checked what you posted:

su userb <command>, and it works, thanks

related to sudo, is sudo a command for any particular distro or it's a general one? because I tried it in a server with this kernel:

Linux debian 2.2.20-idepci #1 Sat Apr 20 12:45:19 EST 2002 i686 GNU/Linux

maybe it's an old kernel version and "sudo" wasn't implemented yet or maybe "sudo" is a bash command feature, in this case the bash version implented in this machine is:

bash --version
bash --version
GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu)
Copyright (C) 2002 Free Software Foundation, Inc.

thanks again for your comments.

Old 03-23-2007, 03:55 PM   #5
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You could set the "suid" bit on the script file. Just keep in mind that you have just opened the door for all hackers that want to become the user that owns the file. The "suid" bit on a file owned by "root" can be a serious security risk.

Overall, the "sudo" command would allow you to maintain better control of your system. "Sudo" is a separate package which may or may not be standard in your distro, but is probably available to you. "sudo" is not connected with bash. It is completely separate.
Old 03-23-2007, 04:06 PM   #6
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Linux doesn't support the "suid" bit on scripts.
Old 03-24-2007, 02:38 AM   #7
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Originally Posted by peji
related to sudo, is sudo a command for any particular distro or it's a general one? because I tried it in a server with this kernel:
sudo is not built in to bash, so you may have to install it:
aptitude install sudo
 - or -
apt-get install sudo


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