[CentOS] exam txt file

Thu Apr 17 12:56:36 UTC 2008
Hiep Nguyen <hiep at ee.ucr.edu>

hi all, i have centos 5 w/o gui.  i can only have access via ssh.

i have a text file that contains special (unprintable) characters, what 
editor i can use to exam what those character are???

i use vi, but i don't know what is ^@

may be an editor that can show ASCII as dec or hex.