(emacs)Single Shell

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Single Shell Commands

   `M-!' (`shell-command') reads a line of text using the minibuffer
executes it as a shell command in a subshell made just for this
command.  Standard input for the command comes from the null device.
If the shell command produces any output, the output goes into an Emacs
buffer named `*Shell Command Output*', which is displayed in another
window but not selected.  A numeric argument, as in `M-1 M-!', directs
this command to insert any output into the current buffer.  In that
case, point is left before the output and the mark is set after the

   If the shell command line ends in `&', it runs asynchronously.

   `M-|' (`shell-command-on-region') is like `M-!' but passes the
contents of the region as input to the shell command, instead of no
input.  If a numeric argument is used, meaning insert output in the
current buffer, then the old region is deleted first and the output
replaces it as the contents of the region.

   Both `M-!' and `M-|' use `shell-file-name' to specify the shell to
use.  This variable is initialized based on your `SHELL' environment
variable when Emacs is started.  If the file name does not specify a
directory, the directories in the list `exec-path' are searched; this
list is initialized based on the environment variable `PATH' when Emacs
is started.  Your `.emacs' file can override either or both of these
default initializations.

   With `M-!' and `M-|', Emacs has to wait until the shell command
completes.  To stop waiting, type `C-g' to quit; that also kills the
shell command.

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