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Top Forums UNIX for Dummies Questions & Answers Knowing when a different program modifies a file Post 302795185 by Don Cragun on Wednesday 17th of April 2013 11:34:33 AM
Old 04-17-2013
I'm guessing that you're really saying that new lines being written to the log file did not show up in your vi editing buffer until you closed vi and reloaded the file. It is extremely unlikely that anything stopped writing to a file because vi had that file open.

When you edit a file using vi (or ex or ed or emacs or any other editor) you load a copy of that file into a buffer. You edit the buffer; not the underlying file. If you want to see recent additions to the file while you are editing it, you need to reload the buffer from the file. In vi, the command to reload the buffer is :e. If you have changed the buffer and have not written the updates back to another file; you'll need to use :e!. If you change the file and write those changes back to the file while some other process is writing to it, whether the changes you made to the file or additions added by that other process or some combination of those changes and additions will appear in the file after you exit vi is unspecified.
 

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EMACSCLIENT(1)						      General Commands Manual						    EMACSCLIENT(1)

NAME
emacsclient - tells a running Emacs to visit a file SYNOPSIS
emacsclient [options] files ... DESCRIPTION
This manual page documents briefly the emacsclient command. Full documentation is available in the GNU Info format; see below. This man- ual page was originally written for the Debian GNU/Linux distribution, but is not specific to that system. emacsclient works in conjunction with the built-in Emacs server. You can either call emacsclient directly or let other programs run it for you when necessary. On GNU and Unix systems many programs con- sult the environment variable EDITOR (sometimes also VISUAL) to obtain the command used for editing. Thus, setting this environment vari- able to 'emacsclient' will allow these programs to use an already running Emacs for editing. Other operating systems might have their own methods for defining the default editor. For emacsclient to work, you need an already running Emacs with a server. Within Emacs, call the functions `server-start' or `server- mode'. (Your `.emacs' file can do this automatically if you add either `(server-start)' or `(server-mode 1)' to it.) When you've finished editing the buffer, type `C-x #' (`server-edit'). This saves the file and sends a message back to the `emacsclient' program telling it to exit. The programs that use `EDITOR' wait for the "editor" (actually, `emacsclient') to exit. `C-x #' also checks for other pending external requests to edit various files, and selects the next such file. If you set the variable `server-window' to a window or a frame, `C-x #' displays the server buffer in that window or in that frame. OPTIONS
The programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). -n, --no-wait returns immediately without waiting for you to "finish" the buffer in Emacs. -e, --eval do not visit files but instead evaluate the arguments as Emacs Lisp expressions. -s, --socket-name=FILENAME use socket named FILENAME for communication. -f, --server-file=FILENAME use TCP configuration file FILENAME for communication. This can also be specified via the `EMACS_SERVER_FILE' environment variable. -a, --alternate-editor=EDITOR if the Emacs server is not running, run the specified editor instead. This can also be specified via the `ALTERNATE_EDITOR' envi- ronment variable. -d, --display=DISPLAY tell the server to display the files on the given display. -V, --version print version information and exit -h, --help print this usage information message and exit SEE ALSO
The program is documented fully in Using Emacs as a Server available via the Info system. AUTHOR
This manual page was written by Stephane Bortzmeyer <bortzmeyer@debian.org>, for the Debian GNU/Linux system (but may be used by others). COPYING
This manual page is in the public domain. EMACSCLIENT(1)
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