Siva Kumar,
AIX by default use ksh shell and to get your history straight away from the command line you have to get into esc mode ( similar to VI).
ESC + k ( previous command) , keep on pressing k to see what all command you have executed
Similarly , if you want to retrive any previous command with its keywords then use ESC+/ , then enter the keyword for ex lsvg , then it will list all the previous commands related to lsvg, then you use 'k' to surf through all the commands.
So its basically , using vi shell commands on the command line, if you know vi well then its very easy
.
HTH
niv