Re: SUDO QUESTION

jim car wrote:
> Why can't a user issue the following commands using sudo?  It always 
> comes back as permission denied.  The sudoer's password is accepted.
> 
> sudo cat ./httpd.tmp >> /etc/httpd/conf/httpd.conf

In this example, two things are happening:
1) sudo authenticates the user and runs "cat ./httpd.tmp" as root
2) the user's shell attempts to open /etc/httpd/conf/httpd.conf and 
write the output of "sudo" into that file.

Redirection is not handled by "sudo", or any other command you run: it's 
a function of the shell in which the redirection was requested. 
Naturally, you can't sudo that.  You can however, accomplish what you 
want this way:

cat ./httpd.tmp | sudo dd if=/dev/stdin of=/etc/httpd/conf/httpd.conf
   ( useless use of cat, primarily intended to display the use of
     /dev/stdin )

or more simply:

sudo dd if=./httpd.tmp of=/etc/httpd/conf/httpd.conf

dd, unlike the shell, will do redirection in a command that can be 
evoked from sudo.



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