sudo piping

[Ohadcn]

i don't know if it is a bug or the OS should behave like that, but i would prefer it other way.
when i run a command as sudo and pipe it to another command or to a file, the command piped as normal user, when i typed

ohad@comp1:~$ sudo echo 10 > /proc/sys/vm/swappiness
bash: /proc/sys/vm/swappiness: Permission denied
ohad@comp1:~$ sudo echo firefox | apt-get install
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?
ohad@comp1:~$

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.