any one can explain to me what this mean??
Line by line please: :P

=================================================
=================================================

# @(#) $Revision: 72.2 $

# Default user .profile file (/usr/bin/sh initialization).

# Set up the terminal:
if [ "$TERM" = "" ]
then
eval ` tset -s -Q -m ':?hp' `
else
eval ` tset -s -Q `
fi
stty erase "^H" kill "^U" intr "^C" eof "^D"
stty hupcl ixon ixoff
tabs

# Set up the search paths:
PATH=$PATH:.

# Set up the shell environment:
set -u
trap "echo 'logout'" 0

# Set up the shell variables:
EDITOR=vi
export EDITOR
mesg -n
PS1="$"
=================================================
=================================================

Thank you very much for explaination.

This one is unix operation system.