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对身份感到困惑

tag-icon • tag-icon files c source
对身份感到困惑

我继承了一堆文件，这些文件的顶部以以下语句开头

Ident:/some/path/to/a/file

Ident 似乎与 C 编码和 make 文件有关，但我不太确定。我拥有的文件都不是源代码或类似的文件。只是文本文件。

身份识别有什么用？

答案1

C 中的 ident 提供有关已编译程序或函数的信息，例如其版本、创建或编辑日期等。一个实用程序，what，可以像这样使用：例如，what func.o，来显示该信息。该信息由 SCCS、RCS 或 CVS 等源代码管理系统填充。

所以假设当你编程时，你将启动一个这样的程序：

识别“$Id$”

    /*
     *      Copyright (C) 2000-2012 Your Name
     *
     *      This program is free software; you can redistribute it and/or
     *      modify it under the terms of version 2 of the GNU General
     *      Public License as published by the Free Software Foundation.
     *
     *      This program is distributed in the hope that it will be useful,
     *      but WITHOUT ANY WARRANTY; without even the implied warranty of
     *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
     *      General Public License for more details.
     *
     *      You should have received a copy of the GNU General Public
     *      License along with this program; if not, write to the Free
     *      Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
     *      MA 02111-1307, USA.
     */
     /*
     *      Name:           $Source$
     *      Purpose:
     *      Version:        $Revision$
     *      Modified:       $Date$
     *      Author:         Your Name
     *      Date:
     *      $Log$
     */

所以这里发生的是与文件相关的所有信息，例如版本号、作者姓名等都被记录下来以供将来参考。

当包含这些 $token$ 字符串的文件被放入 CVS 中时，这些标记将像这样被翻译：

    #ident  "$Id: histfile.c,v 1.1.1.1 2011/10/07 18:06:40 trona Exp $"

    /*
     *      Copyright (C) 2000-2012 Your Name
     *
     *      This program is free software; you can redistribute it and/or
     *      modify it under the terms of version 2 of the GNU General
     *      Public License as published by the Free Software Foundation.
     *
     *      This program is distributed in the hope that it will be useful,
     *      but WITHOUT ANY WARRANTY; without even the implied warranty of
     *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
     *      General Public License for more details.
     *
     *      You should have received a copy of the GNU General Public
     *      License along with this program; if not, write to the Free
     *      Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
     *      MA 02111-1307, USA.
     *
     *      Name:           $Source: /usr/local/cvsroot/utils/histfile.c,v $
     *      Purpose:        display content of a user's .sh_history file
     *      Version:        $Revision: 1.1.1.0 $
     *      Modified:       $Date: 2012/10/07 18:06:40 $
     *      Author:         Your Name
     *      Date:           24 Jun 2012
     *      $Log: histfile.c,v $
     *      Revision 1.1.1.1  2012/10/07 18:06:40  trona
     *      initial installation Slackware 13.0
     *
     */

$Log$ 令牌非常重要；在一个由多人编辑代码的项目中，每次编辑都会记录一条注释，描述所做的事情、为什么这样做以及何时完成。

不幸的是，what 实用程序尚未移植到 Linux，但如果您感兴趣，可以从 Sourceforge 托管的 The Heirloom 项目中获取。

它有点大，但我希望你能得到你正在寻找的信息。

您也可以参考这个链接：http://www.unix.com/programming/26107-what-ident.html

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