Ubuntu grep does not remove unwanted lines

Question

On ubuntu, i search for "ubuntu" locations

find / -name ubuntu 

I get lots of lines with "Permission denied" I try to remove the lines

find / -name ubuntu | grep -v Permission

I still get the unwanted lines

How to fix this?

Answer 1

It's because the errors from find are going to stderr. You can redirect stderr to stdout as well and then the filtering with grep would work.

find / -name ubuntu 2>&1 | grep -v Permission

1 represents standard output and 2 represents standard error. 2>&1 denotes "redirect stderr to wherever stdout goes".