My .vimrc

This is the .vimrc I'm using now. I got from here. Stick this on your home directory.

set nocompatible "This fixes the problem where arrow keys do not function properly on some systems.
syntax on  "Enables syntax highlighting for programming languages
"set mouse=a  "Allows you to click around the text editor with your mouse to move the cursor
set showmatch "Highlights matching brackets in programming languages
set autoindent  "If you're indented, new lines will also be indented
set cindent  "Automatically indents lines after opening a bracket in programming languages
set smartindent
set backspace=2  "This makes the backspace key function like it does in other programs.
set tabstop=8  "How much space Vim gives to a tab
set number  "Enables line numbering
set smarttab  "Improves tabbing
set expandtab  "Expand tabs into spaces"
set shiftwidth=4  "Assists code formatting
colorscheme delek  "Changes the color scheme. Change this to your liking. Lookin /usr/share/vim/vim61/colors/ for options.
"setlocal spell  "Enables spell checking (CURRENTLY DISABLED because it's kinda annoying). Make sure to uncomment the next line if you use this.
"set spellfile=~/.vimwords.add  "The location of the spellcheck dictionary. Uncomment this line if you uncomment the previous line.
"set foldmethod=manual  "Lets you hide sections of code
"--- The following commands make the navigation keys work like standard editors
imap <silent> <Down> <C-o>gj
imap <silent> <Up> <C-o>gk
nmap <silent> <Down> gj
nmap <silent> <Up> gk
"--- Ends navigation commands
"--- The following adds a sweet menu, press F4 to use it.
source $VIMRUNTIME/menu.vim
set wildmenu
set cpo-=<
set wcm=<C-Z>
map <F4> :emenu <C-Z>
"--- End sweet menu
"show current filename
set modeline
set ls=2
" Searches in bold yellow
hi Search ctermfg=Yellow ctermbg=NONE cterm=bold
" make tab in v mode indent code
vmap <tab> >gv
vmap <s-tab> <gv
" make tab in normal mode indent code
nmap <tab> I<tab><esc>
nmap <s-tab> ^i<bs><esc>
" paste mode - this will avoid unexpected effects when you
" cut or copy some text from one window and paste it in Vim.
set pastetoggle=<F11>
" comment/uncomment blocks of code (in vmode)
vmap _c :s/^/#/gi<Enter>
vmap _C :s/^#//gi<Enter>
" Tidy selected lines (or entire file) with _t:
nnoremap <silent> _t :%!perltidy -q<Enter>
vnoremap <silent> _t :!perltidy -q<Enter>
" Deparse obfuscated code
nnoremap <silent> _d :.!perl -MO=Deparse 2>/dev/null<cr>
vnoremap <silent> _d :!perl -MO=Deparse 2>/dev/null<cr>

Vi Text Editor My Frequently Used Commands

h              move cursor one character to left
j              move cursor one line down
k              move cursor one line up
l              move cursor one character to right
w              move cursor one word to right
b              move cursor one word to left
0              move cursor to beginning of line
$              move cursor to end of line
nG             move cursor to line n
1G             move cursor to 1st line
G              move cursor to last line
control-f      scroll forward one screen
control-b      scroll backward one screen

gx             jump to method definition

zi             switch folding on or off
za             toggle current fold open/closed
zc             close current fold
zR             open all folds
zM             close all folds
zv             expand folds to reveal cursor

i              insert to left of current cursor position (end with ESC)
a              append to right of current cursor position (end with ESC)
dw             delete current word (end with ESC)
cw             change current word (end with ESC)
r              change current character
~              change case (upper-, lower-) of current character

dd             delete current line
D              delete portion of current line to right of the cursor
x              delete current character
dgg            delete current line to the top of the file
jdG            delete all lines below current line
ma             mark currrent position
d`a            delete everything from the marked position to here
`a             go back to the marked position
p              dump out at current place your last deletion (``paste'')

u              undo the last command 
.              repeat the last command 

J              combine (``join'') next line with this one

:w             write file to disk, stay in vi
:q!            quit VI, do not write file to disk,
ZZ             write file to disk, quit vi

:r filename    read in a copy of the specified file to the current
               buffer

/string        search forward for string (end with Enter)
?string        search backward for string (end with Enter)
n              repeat the last search (``next search'')
N              repeat the last search backward
/\cstring      case insensitive prepend with \c

:s/s1/s2       replace (``substitute'') (the first) s1 in this line by s2
:lr/s/s1/s2/g  replace all instances of s1 in the line range lr by s2
               (lr is of form 'a,b', where a and b are either explicit
               line numbers, or . (current line) or $ (last line)
:map k s       map the key k to a string of vi commands s (see below)
:abb s1 s2     expand the string s1 in append/insert mode to a string 
               s2 (see below)
%              go to the "mate," if one exists, of this parenthesis
               or brace or bracket (very useful for programmers!)

:%s/foo/bar/g  replace every 'foo' with a 'bar'
:!command      execute a command from vi
:%!perltidy    format perl code using perltidy from within vi
:%!perltidy -l=0    ignore line length 
:noh           remove search highlighting
:sp            to split window horizontally
:vsp           to split window vertically
<ctrl-w>h|j|k|l to navigate between split windows
<ctrl-w>q      to quit split window 

Comment/Uncomment:
Press Ctrl+V and go down until the last commented line and press x, that will delete all the # characters vertically.

For commenting a block of text is almost the same: First, go to the first line you want to comment, press Ctrl+V, and select until the last line. Second, press Shift+I, then #, then Esc.

Indent several lines at once:
Press Ctrl+V and go down until the last line to be indented, press Shift+>

Cut/Copy and Paste:
Position the cursor where you want to begin cutting.
Press v (or upper case V if you want to cut whole lines).
Move the cursor to the end of what you want to cut.
Press d to cut or y to copy.
Move to where you would like to paste.
Press P to paste before the cursor, or p to paste after.
Copy and paste can be performed with the same steps, only pressing y instead of d in step 4.
The name of the mark used is related to the operation (d:delete or y:yank).