My .vimrc file

syntax on
set viminfo^=h
set ruler
set nohls
set incsearch
set showmatch
set ts=4 sw=4
syntax enable
set hlsearch
"Use F4 to switch high lighting on/off
:noremap <F4> :set hlsearch! hlsearch<CR>

Shell Scripting: Special Variables

$?        Exit status or return code of last command.
$#        Number of arguments.
$@        Argument 1 thru n with Input Field Separator.
$*        "$1" $2" ... $n.
$!        Process id of last background process.
$$        Process id of shell running this script.
$-        The current shell flags.