gksudo 16.10

Karl Auer kauer at biplane.com.au
Sun Nov 6 12:32:46 UTC 2016


On Sun, 2016-11-06 at 13:21 +0100, Ralf Mardorf wrote:
> On Sun, 06 Nov 2016 23:01:03 +1100, Karl Auer wrote:
> > 
> > On Sun, 2016-11-06 at 12:05 +0100, Ralf Mardorf wrote:
> > > 
> > > [root at archlinux ~]# sudo -u rocketmouse echo $HOME
> > > /root  
> > When you use a variable on the command line it is expanded before
> > the
> > command line is executed. So the above command is the equivalent
> > of:
> > 
> >    sudo -u rocketmouse echo "/root"
> > 
> > > 
> > > [root at archlinux ~]# sudo -u rocketmouse HOME=/home/rocketmouse
> > > echo
> > > $HOME   
> > Again, $HOME is expanded before the assignment is made, so that
> > command
> > is the equivalent of:
> > 
> >    sudo -u rocketmouse HOME=/home/rocketmouse echo "/root"
> > 
> > So you will need to rethink many of those tests...
> When a user runs
>   sudo HOME=/root appname
> the /root directory is used.
> The home directory of "username" also is used when running
>   gksudo -u username app
> so why isn't "echo $HOME" not equal to the used directory?

That's not the same as what you wrote first :-)

Let's say you are logged in as fred, and $HOME is "/home/fred".

Now you run this command:

   sudo echo $HOME

What happens is that the shell expands $HOME, creating a command line
that looks like this:

   sudo echo /home/fred

Then it executes sudo, passing it two arguments "echo" and
"/home/fred".

Regards, K.


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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