Description of problem:

PackageKit-command-not-found writes its output to stdout. If stdout is being redirected or piped, no visible output is produced. This could be confused with successful execution of the command.

For consistency with bash's normal "command not found" error messages, it should write to stderr instead.

Version-Release number of selected component (if applicable):

PackageKit-command-not-found-0.5.4-0.4.20091029git.fc12.i686

How reproducible: Always

Steps to Reproduce:

With the command-not-found handler enabled:
$ abc >stdout 2>stderr
$ cat stdout 
Command not found. 
$ cat stderr 

With it disabled:
$ ( unset command_not_found_handle; abc >stdout 2>stderr ) 
$ cat stdout 
$ cat stderr 
-bash: abc: command not found