re-create AIX /dev/null

The type of /dev/null was accidentally changed  by command "rm /dev/null*"

Its type should be char device as shown below.

-rw-r--r--    1 root     system    619851909 May 15 14:23 null 2>&1
crw-rw-rw-    1 root     system        2,  2 May 15 14:24 null

after "rm null*" , it became 

-rw-r--r--    1 root     system           41 May 15 14:24 null
-rw-r--r--    1 root     system          190 May 15 14:24 null 2>&1

something like a normal file.

Googled but those solution doesn't work, as I failed to delete /dev/null "file" although there is no error message returned.

e.g.  

rm /dev/null ; mknod -m 0666 /dev/null c 2 2 ; chown root:system /dev/null

So my solution is to reboot the server, and it works for me since this is a test server.
 #ls -l null*
crw-rw-rw-    1 root     system        2,  2 May 15 14:56 null
-rw-r--r--    1 root     system        31458 May 15 14:56 null 2>&1

My understanding of Async I/O setting for Oracle Database on AIX platform

The following diagram is based on my understanding of page 54, 55 and 66 of document Oracle Architecture and Tuning on AIX (v 2.20).pdf

how to turn on autocomplete in AIX 6.1?

Under ksh, do the following:
set -o vi
Filename completion -   ESC + '\'    [ escape + backslash ]
Previous command -  ESC + 'k'