Re: dapper sudo

Jack Bowling wrote:
On Tue, Jul 04, 2006 at 02:44:14PM +0100, Toby Kelsey wrote:
boricua wrote:
how come dapper does not allow me to do this

sudo cat /dev/null > /var/log/apache2/error.log


Because the sudo only applies to the command 'cat', not the redirection.

Try
sudo dd of=/var/log/apache2/error.log < /dev/null
or
sudo tee /var/log/apache2/error.log < /dev/null


It is a bug that there is no obvious command to truncate a file.


Could somebody tell me if there is any difference between the above cat
command and

[sudo] echo "" > /var/log/apache2/error.log

assuming one has sudo'ed to a root shell?

That assumption is the difference. So, yes, there IS a *HUGE* difference
between

sudo -s
echo > /var/log/apache2/error.log

(BTW: No need for the "echo" here, unless you're really after an empty
line).

and

sudo tee /var/log/apache2/error.log < /dev/null


The difference is, that the shell "executing" "> /var/log/apache2/error.log"
is run with root rights. That's actually more-or-less the same as doing

sudo sh -c " > /var/log/apache2/error.log"

Alexander Skwar
--
The more laws and order are made prominent, the more thieves and
robbers there will be.
-- Lao Tsu

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