Linux中如何使用whereis命令快速查找文件

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  Linux下whereis命令和find命令有点相似,whereis命令查找速度更快,但只能查找程序名,下面随小编一起来了解下whereis命令的具体用法吧。

  whereis命令只搜索二进制文件(参数-b)、man说明文件(参数-m)和源代码文件(参数-s)。如果省略参数,则返回所有信息。

  和find相比,whereis查找的速度非常快,这是因为linux系统会将 系统内的所有文件都记录在一个数据库文件中,当使用whereis和下面即将介绍的locate时,会从数据库中查找数据,而不是像find命令那样,通 过遍历硬盘来查找,效率自然会很高。

  但是该数据库文件并不是实时更新,默认情况下时一星期更新一次,因此,我们在用whereis和locate 查找文件时,有时会找到已经被删除的数据,或者刚刚建立文件,却无法查找到,原因就是因为数据库文件没有被更新。

  1.命令格式:

  whereis [-bmsu] [BMS 目录名 -f ] 文件名

  2.命令功能:

  whereis命令是定位可执行文件、源代码文件、帮助文件在文件系统中的位置。这些文件的属性应属于原始代码,二进制文件,或是帮助文件。whereis 程序还具有搜索源代码、指定备用搜索路径和搜索不寻常项的能力。

  3.命令参数:

  -b 定位可执行文件。

  -m 定位帮助文件。

  -s 定位源代码文件。

  -u 搜索默认路径下除可执行文件、源代码文件、帮助文件以外的其它文件。

  -B 指定搜索可执行文件的路径。

  -M 指定搜索帮助文件的路径。

  -S 指定搜索源代码文件的路径。

  4.使用实例:

  实例1:将和**文件相关的文件都查找出来

  命令:

  whereis svn

  输出:

  [root@localhost ~]# whereis tomcat

  tomcat:

  [root@localhost ~]# whereis svn

  svn: /usr/bin/svn /usr/local/svn /usr/share/man/man1/svn.1.gz

  说明:

  tomcat没安装,找不出来,svn安装找出了很多相关文件

  实例2:只将二进制文件 查找出来

  命令:

  whereis -b svn

  输出:

  [root@localhost ~]# whereis -b svn

  svn: /usr/bin/svn /usr/local/svn

  [root@localhost ~]# whereis -m svn

  svn: /usr/share/man/man1/svn.1.gz

  [root@localhost ~]# whereis -s svn

  svn:

  [root@localhost ~]#

  说明:

  whereis -m svn 查出说明文档路径,whereis -s svn 找source源文件。

  上面就是Linux下whereis命令的用法介绍了,whereis命令搜索的条件比较局限,如果你只搜索程序名的话,使用whereis命令是非常快的。

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