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(viper)Shell Commands

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Shell Commands
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   The symbol `%' is used in Ex shell commands to mean current file.  If
you want a `%' in your command, it must be escaped as `\%'.  However if
`%' is the first character, it stands as the address for the whole file.
Similarly, `#' expands to the previous file.  The previous file is the
first file in `:args' listing.  This defaults to the previous file in
the VI sense if you have one window.

   Symbols `%' and `#' are also used in the Ex commands `:e' and `:r
<shell-cmd>'.  The commands `:w' and the regular `:r <file>' command
don't support these meta symbols, because file history is a better
mechanism.

`:sh'
     Execute a subshell in another window

`:[x,y]!<cmd>'
     Execute a shell <cmd> [on lines x through y; % is replace by
     current file, \% is changed to %

`:[x,y]!! [<args>]'
     Repeat last shell command [and append <args>].

`:!<cmd>'
     Just execute command and display result in a buffer.

`:!! <args>'
     Repeat last shell command and append <args>

`<count> !<move><cmd>'
     The shell executes <cmd>, with standard input the lines described
     by <count><move>, next the standard output replaces those lines
     (think of `cb', `sort', `nroff', etc.).

`<count> !!<cmd>'
     Give <count> lines as standard input to the shell <cmd>, next let
     the standard output replace those lines.

`:[x,y] w !<cmd>'
     Let lines x to y be standard input for <cmd> (notice the <sp>
     between `w' and `!').

`:<address>r !<cmd>'
     Put the output of <cmd> after the line <address> (default current).

`:<address>r <name>'
     Read the file <name> into the buffer after the line <address>
     (default current).

`:make'
     Run the make command in the current directory.