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Code Editor : jed008.html

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<h2 id="sec11" class="section">7&#X2003;Backup and Auto-save Files</h2>
On UNIX and MS-DOS systems, jed creates backup files by appending
a <code class="verb">~</code> character to the filename. The VMS operating system
handles backup files itself. jed periodically auto-saves its
buffers. On UNIX and MS-DOS, auto-save files are prefixed with the
pound sign #. On VMS, they are prefixed with <code class="verb">_$</code>. The auto-save interval may be changed by setting the variable
<code class="verb">MAX_HITS</code> to the desired value. The default is 300 &#X201C;hits&#X201D; on
the buffer. A &#X201C;hit&#X201D; is defined as a key which MAY change the state
of the buffer. Cursor movement keys do not cause hits on the buffer.Like many of jed&#X2019;s features, the names of auto-save and backup files can be
controlled by the user. The file <code class="verb">site.sl</code> defines two functions,
<code class="verb">make_backup_filename</code>, and <code class="verb">make_autosave_filename</code> that
generate the file names described in the previous paragraph. Like all
S&#X2013;Lang functions, these functions may be overloaded and replaced with
different ones. See also information about <code class="verb">find_file_hook</code> in the
section on hooks.On UNIX systems, jed catches most signals and tries to auto-save its
buffers in the event of a crash or if the user accidently disconnects from
the system (SIGHUP).If an auto-save file exists and you is desire to recover data from the
auto-save file, use the function <code class="verb">recover_file</code>. Whenever jed finds a
file, it checks to see if an auto-save file exists as well as the file&#X2019;s
date. If the dates are such that the auto-save file is more recent jed
will display a message in the mini-buffer alerting the user of this fact
and that the function <code class="verb">recover_file</code> should be considered.
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