http://freebsdwiki.net/index.php?action=history&feed=atom&title=Unlink 2026-05-04T16:08:42Z Revision history for this page on the wiki MediaWiki 1.18.0 http://freebsdwiki.net/index.php?title=Unlink&diff=5170&oldid=prev 2005-07-12T10:23:38Z

<p>(polishing)</p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr valign='top'> <td colspan='2' style="background-color: white; color:black;">← Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 10:23, 12 July 2005</td> </tr><tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>This command <del class="diffchange diffchange-inline">do </del>exactly the same as [[rm]] : it removes files. If you have read the section about [[links]] you know that one file contents can be read and write <del class="diffchange diffchange-inline">throw </del>one or more <del class="diffchange diffchange-inline">files thant's </del>to hard links. So the [[unlink]] command is the exact oposite of the [[ln]] command : it removes one link, and if <del class="diffchange diffchange-inline">to </del>more links are available for the file contents, it <del class="diffchange diffchange-inline">can not be acceeded </del>and will be overwritten <del class="diffchange diffchange-inline">by </del>other <del class="diffchange diffchange-inline">information</del>.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>This command <ins class="diffchange diffchange-inline">does </ins>exactly the same <ins class="diffchange diffchange-inline">thing </ins>as [[rm]] : it removes files. If you have read the section about [[links]] you know that one file<ins class="diffchange diffchange-inline">'s </ins>contents can be read and write <ins class="diffchange diffchange-inline">through </ins>one or more <ins class="diffchange diffchange-inline">directory entries thanks </ins>to hard links. So the [[unlink]] command is the exact oposite of the [[ln]] command : it removes one link, and if <ins class="diffchange diffchange-inline">no </ins>more links are available for the file contents, it <ins class="diffchange diffchange-inline">will effectively disappear from the filesystem, </ins>and <ins class="diffchange diffchange-inline">its contents </ins>will <ins class="diffchange diffchange-inline">eventually </ins>be overwritten <ins class="diffchange diffchange-inline">as </ins>other <ins class="diffchange diffchange-inline">data is written to the filesystem</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>The number of hard links for a file can displayed by the [[ls]] command.</div></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"><div>The number of hard links for a file can displayed by the [[ls]] command.</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'>&#160;</td><td style="background: #eee; color:black; font-size: smaller;"></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Note that the C programming language primitive for deleting files is :</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>Note that the C programming language primitive for deleting files is : unlink()</div></td></tr> <tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline"> </del>unlink()</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>&#160;</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">[[Category:System Commands]]</ins></div></td></tr> <!-- diff cache key bsdwiki:diff:version:1.11a:oldid:2887:newid:5170 --> </table>

Jimbo http://freebsdwiki.net/index.php?title=Unlink&diff=2887&oldid=prev 2005-07-12T08:07:02Z

<p></p> <p><b>New page</b></p><div>This command do exactly the same as [[rm]] : it removes files. If you have read the section about [[links]] you know that one file contents can be read and write throw one or more files thant's to hard links. So the [[unlink]] command is the exact oposite of the [[ln]] command : it removes one link, and if to more links are available for the file contents, it can not be acceeded and will be overwritten by other information.<br /> <br /> The number of hard links for a file can displayed by the [[ls]] command.<br /> <br /> Note that the C programming language primitive for deleting files is :<br /> unlink()</div>

Smortex