Adrien wrote:
> Hi,

<snip>

> Also, on my computer, I have the following behaviour:
>     11:44 ~ % sudo echo 0 > /proc/sys/kernel/randomize_va_space
>     zsh: permission denied: /proc/sys/kernel/randomize_va_space
>     root@jarjar:~# echo 0 > /proc/sys/kernel/randomize_va_space
>     root@jarjar:~#
> I can't use sudo to write to most files in /proc or /sys: I have to log in
> as root ('su -' does the job just fine).

The redirection (> /proc/sys...) is not part of the sudo invocation, it's a separate instruction to the *shell* to redirect output of the previous part of the command to a file and so it runs with *your* uid. There are two ways to achieve what you're after - one verbose one described in the sudo man page (essentially you pass the whole command line to sudo quoted) or the easier way:

echo 0| sudo tee /proc/sys/kernel/randomize_va_space

You can add > /dev/null if tee's outputting of the 0 to stdout is for some reason annoying.


David