Emacs. Your changes appear in the file itself only when you @dfn{save} the
buffer back into the file.
+@cindex files, remote
+@cindex remote files
+ Emacs is also able to handle ``remote files'' which are stored on
+other hosts. Not only is Emacs somewhat aware of the special issues
+involved with network file systems, but it can also use FTP and ssh (or
+rsh) to make local copies of the files, and refresh them on the remote
+host automatically when you save the buffer. The FTP interface is
+provided by the standard @samp{efs} package @ref{Top, EFS, , efs}. The
+ssh/rsh interface is provided by the optional @samp{tramp} package
+@ref{Top, TRAMP, , tramp}. These packages attempt to implement all of
+the operations described below, making remote file use transparent
+(except for unavoidable network delays).
+
In addition to visiting and saving files, Emacs can delete, copy, rename,
and append to files, and operate on file directories.
makes it easy to operate on that file with any of the Emacs file
commands.
+The syntax for accessing remote files unfortunately varies depending on
+the method used. The syntax for using FTP is
+@samp{/@var{user}@@@var{remote-host}:@var{path-on-remote-host}}. The
+syntax for using ssh is
+@samp{/[@var{user}@@@var{remote-host}]@var{path-on-remote-host}}.
+
+ In both cases the @samp{@var{user}@@} portion is optional (it defaults
+to your local user name). @var{path-on-remote-host} may use the
+@samp{~} notation to indicate @var{user}'s home directory on the remote
+host. The default file name will reflect the remote host information.
+
@vindex default-directory
Each buffer has a default directory, normally the same as the
directory of the file visited in that buffer. When Emacs reads a file
@samp{../.login} would stand for @file{/u/rms/.login}. @samp{new/foo}
would stand for the filename @file{/u/rms/gnu/new/foo}.
+ When visiting a remote file via EFS or TRAMP, the remote directory
+becomes the default directory (@pxref{Visiting}) for that buffer, just
+as a local directory would.
+
@vindex default-directory-alist
The variable @code{default-directory-alist} takes an alist of major
modes and their opinions on @code{default-directory} as a Lisp
@code{buffer-file-truename} of all visited files when deciding whether a
given file is already in a buffer, instead of just
@code{buffer-file-name}. If you attempt to visit another file which is
-a hard-link or symbolic-link to a file that is already in a buffer, the
-existing buffer will be found instead of a newly created one.
+a symbolic link to a file that is already in a buffer, the existing
+buffer will be found instead of a newly created one. This works if any
+component of the pathname (including a non-terminal component) is a
+symbolic link as well, but doesn't work with hard links (nothing does).
@cindex creating files
If you want to create a file, just visit it. Emacs prints
that newly made backup is included in the count in @code{kept-new-versions}.
By default, both variables are 2.
-@vindex trim-versions-without-asking
- If @code{trim-versions-without-asking} is non-@code{nil}, excess
+@vindex delete-old-versions
+ If @code{delete-old-versions} is non-@code{nil}, excess
middle versions are deleted without notification. If it is @code{nil}, the
default, you are asked whether the excess middle versions should
really be deleted.
operates on the current buffer. Since reverting a buffer can result in
very extensive changes, you must confirm it with @kbd{yes}.
- If the current buffer has been auto-saved more recently than it has been
-saved explicitly, @code{revert-buffer} offers to read the auto save file
-instead of the visited file (@pxref{Auto Save}). Emacs asks you about
-the auto-save file before the request for confirmation of the
-@kbd{revert-buffer} operation, and demands @kbd{y} or @kbd{n}
-as an answer. If you have started to type @kbd{yes} for confirmation
-without realizing that the auto-save question was going to be asked, the
-@kbd{y} will answer that question, but the @kbd{es} will not be valid
-confirmation. This gives you a chance to cancel the operation with
-@kbd{C-g} and try again with the answers you really intend.
-
- @code{revert-buffer} keeps point at the same distance (measured in
-characters) from the beginning of the file. If the file was edited only
-slightly, you will be at approximately the same piece of text after
-reverting as before. If you have made more extensive changes, the value of
-point in the old file may bring you to a totally different piece of text
-than your last editing point.
+ You may request that @code{revert-buffer} check for an auto-save file
+that is more recent than the visited file by providing a prefix
+argument. If a recent auto-save file exists, @code{revert-buffer}
+offers to read the auto-save file instead of the visited file
+(@pxref{Auto Save}). Emacs asks you about the auto-save file before the
+request for confirmation of the @kbd{revert-buffer} operation, and
+demands @kbd{y} or @kbd{n} as an answer. If you have started to type
+@kbd{yes} to confirm the revert operation, the @kbd{y} will answer the
+question about using the auto-save file, but the @kbd{es} will not be
+valid confirmation for the reversion. This gives you a chance to cancel
+the operation with @kbd{C-g} and try again with the answers you really
+intend.
+
+ @code{revert-buffer} preserves the value of point (in characters from
+the beginning of the file). If the file was edited only slightly, you
+will be at approximately the same piece of text after reverting as
+before. If you have made more extensive changes, after reversion point
+may be in a totally different context than your last edits before
+reversion.
A buffer reverted from its visited file is marked ``not modified'' until
-you make a change.
+you make a change. The buffer's modes will also be recalculated, by
+@code{normal-mode}.
Some kinds of buffers whose contents reflect data bases other than files,
such as Dired buffers, can also be reverted. For them, reverting means
-recalculating their contents from the appropriate data. Buffers
-created randomly with @kbd{C-x b} cannot be reverted; @code{revert-buffer}
+refreshing their contents from the appropriate data. Buffers created
+randomly with @kbd{C-x b} cannot be reverted; @code{revert-buffer}
reports an error when asked to do so.
@node Auto Save, Version Control, Reverting, Files
projects / chise / xemacs-chise.git.1 / blobdiff