vim usage

" global command display 
:g/gladiolli/#              : display with line numbers (YOU WANT THIS!)
:g/fred.*joe.*dick/         : display all lines fred,joe & dick
:g/\<fred\>/                : display all lines fred but not freddy
:g/^\s*$/d                  : delete all blank lines
:g!/^dd/d                   : delete lines not containing string
:v/^dd/d                    : delete lines not containing string
:g/joe/,/fred/d             : not line based (very powerfull)
:g/fred/,/joe/j             : Join Lines *N*
:g/-------/.-10,.d          : Delete string & 10 previous lines
:g/{/ ,/}/- s/
\+/\r/g     : Delete empty lines but only between {...}
:v/\S/d                     : Delete empty lines (and blank lines ie whitespace)
:v/./,/./-j                 : compress empty lines
:g/^$/,/./-j                : compress empty lines
:g/<input\|<form/p          : ORing
:g/^/put_                   : double space file (pu = put)
:g/^/m0                     : Reverse file (m = move)
:g/^/m$                     : No effect! *N*
:'a,'bg/^/m'b               : Reverse a section a to b
:g/^/t.                     : duplicate every line
:g/fred/t$                  : copy(transfer) lines matching fred to EOF
:g/stage/t'a                : copy (transfer) lines matching stage to marker a (cannot use .) *C*
:g/^Chapter/t.|s/./-/g      : Automatically underline selecting headings *N*
:g/\(^I[^^I]*\)\{80}/d      : delete all lines containing at least 80 tabs
" perform a substitute on every other line
:g/^/ if line('.')%2|s/^/zz / 
" match all lines containing "somestr" between markers a & b
" copy after line containing "otherstr"
:'a,'bg/somestr/co/otherstr/ : co(py) or mo(ve)
" as above but also do a substitution
:'a,'bg/str1/s/str1/&&&/|mo/str2/
:%norm jdd                  : delete every other line
" incrementing numbers (type <c-a> as 5 characters)
:.,$g/^\d/exe "norm! \<c-a>": increment numbers
:'a,'bg/\d\+/norm! ^A       : increment numbers
" storing glob results (note must use APPEND) you need to empty reg a first with qaq. 
"save results to a register/paste buffer
:g/fred/y A                 : append all lines fred to register a
:g/fred/y A | :let @*=@a    : put into paste buffer
:let @a=''|g/Barratt/y A |:let @*=@a
" filter lines to a file (file must already exist)
:'a,'bg/^Error/ . w >> errors.txt
" duplicate every line in a file wrap a print '' around each duplicate
:g/./yank|put|-1s/'/"/g|s/.*/Print '&'/
" replace string with contents of a file, -d deletes the "mark"
:g/^MARK$/r tmp.txt | -d
" display prettily
:g/<pattern>/z#.5           : display with context
:g/<pattern>/z#.5|echo "=========="  : display beautifully
" Combining g// with normal mode commands
:g/|/norm 2f|r*                      : replace 2nd | with a star
"send output of previous global command to a new window
:nmap <F3>  :redir @a<CR>:g//<CR>:redir END<CR>:new<CR>:put! a<CR><CR>
"----------------------------------------
" Global combined with substitute (power editing)
:'a,'bg/fred/s/joe/susan/gic :  can use memory to extend matching
:/fred/,/joe/s/fred/joe/gic :  non-line based (ultra)
:/biz/,/any/g/article/s/wheel/bucket/gic:  non-line based *N*
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" Find fred before beginning search for joe
:/fred/;/joe/-2,/sid/+3s/sally/alley/gIC
"----------------------------------------
" create a new file for each line of file eg 1.txt,2.txt,3,txt etc
:g/^/exe ".w ".line(".").".txt"
"----------------------------------------
" chain an external command
:.g/^/ exe ".!sed 's/N/X/'" | s/I/Q/    *N*