Commit d408f8d0 authored by Richard M. Stallman's avatar Richard M. Stallman
Browse files

Give examples for M-! and M-|.

parent c4a9bc8e
......@@ -357,15 +357,23 @@ for that command. Standard input for the command comes from the null
device. If the shell command produces any output, the output appears
either in the echo area (if it is short), or in an Emacs buffer named
@samp{*Shell Command Output*}, which is displayed in another window
but not selected (if the output is long). A numeric argument, as in
@kbd{M-1 M-!}, directs this command to insert any output into the
current buffer instead. In that case, point is left before the output
and the mark is set after the output.
but not selected (if the output is long).
For instance, one way to decompress a file @file{foo.gz} from Emacs
is to type @kbd{M-! gunzip foo.gz @key{RET}}. That shell command
normally creates the file @file{foo} and produces no terminal output.
A numeric argument, as in @kbd{M-1 M-!}, says to insert terminal
output into the current buffer instead of a separate buffer. It puts
point before the output, and sets the mark after the output. For
instance, @kbd{M-1 M-! gunzip < foo.gz @key{RET}} would insert the
uncompressed equivalent of @file{foo.gz} into the current buffer.
If the shell command line ends in @samp{&}, it runs asynchronously.
For a synchronous shell command, @code{shell-command} returns the
command's exit status (0 means success), when it is called from a Lisp
program.
program. You do not get any status information for an asynchronous
command, since it hasn't finished yet.
@kindex M-|
@findex shell-command-on-region
......@@ -376,6 +384,13 @@ insert the output in the current buffer, then the old region is deleted
first and the output replaces it as the contents of the region. It
returns the command's exit status when it is called from a Lisp program.
One use for @kbd{M-|} is to run @code{uudecode}. For instance, if
the buffer contains uuencoded text, type @kbd{C-x h M-| uudecode
@key{RET}} to feed the entire buffer contents to the @code{uudecode}
program. That program will ignore everything except the encoded text,
and will store the decoded output into the file whose name is
specified in the encoded text.
@vindex shell-file-name
@cindex environment
Both @kbd{M-!} and @kbd{M-|} use @code{shell-file-name} to specify the
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment