Merge pull request #12061 from MjSeven/20190109

翻译完成 20190109 Understanding...

translated/tech/20190109 Understanding -etc-services file in Linux.md

@@ -7,46 +7,44 @@
 [#]: via: (https://kerneltalks.com/linux/understanding-etc-services-file-in-linux/)
 [#]: author: (kerneltalks https://kerneltalks.com)
 
-Understanding /etc/services file in Linux
+理解 Linux 中的 /etc/services 文件
 ======
 
-Article which helps you to understand /etc/services file in Linux. Learn about content, format & importance of this file.
+这篇文章将帮助你了解 Linux 中 /etc/services 文件，包括它的内容，格式以及重要性。
 
 ![/etc/services file in Linux][1]
-/etc/services file in Linux
+Linux 中的 /etc/services 文件
 
-Internet daemon is important service in Linux world. It takes care of all network services with the help of `/etc/services` file. In this article we will walk you through content, format of this file and what it means to a Linux system.
+网络守护程序是 Linux 世界中的重要服务。它借助 `/etc/services` 文件来处理所有网络服务。在本文中，我们将向你介绍这个文件的内容，格式以及它对于 Linux 系统的意义。
 
-`/etc/services` file contains list of network services and ports mapped to them. `inetd` or `xinetd` looks at these details so that it can call particular program when packet hits respective port and demand for service.
+`/etc/services` 文件包含网络服务和它们映射端口的列表。`inetd` 或 `xinetd` 会查看这些细节，以便在数据包到达各自的端口或服务有需求时，它会调用特定的程序。
 
-As a normal user you can view this file since file is world readable. To edit this file you need to have root privileges.
+作为普通用户，你可以查看此文件，因为文件一般都是可读的。要编辑此文件，你需要有 root 权限。
 
 ```
 $ ll /etc/services
 -rw-r--r--. 1 root root 670293 Jun  7  2013 /etc/services
 ```
 
-### `/etc/services` file format
+### `/etc/services` 文件格式
 
 ```
 service-name    port/protocol   [aliases..]  [#comment]
 ```
 
-Last two fields are optional hence denoted in `[` `]`
+最后两个字段是可选的，因此用 `[` `]` 表示。
 
-where –
+其中：
 
-  * service-name is name of the network service. e.g. [telnet][2], [ftp][3] etc.
+ * service-name 是网络服务的名称。例如 [telnet][2], [ftp][3] 等。
-  * port/protocol is port being used by that network service (numerical value) and protocol (TCP/UDP) used for communication by service.
+ * port/protocol 是网络服务使用的端口（一个数值）和服务通信使用的协议（TCP/UDP）。
-  * alias is alternate name for service.
+ * alias 是服务的别名。
-  * comment is note or description you can add to service. Starts with `#` mark
+ * comment 是你可以添加到服务的注释或说明。以 `#` 标记开头。
 
-
+### `/etc/services` 文件示例
-
-### Sample` /etc/services` file
 
 ```
-# Each line describes one service, and is of the form:
+# 每行描述一个服务，形式如下：
 #
 # service-name  port/protocol  [aliases ...]   [# comment]
 
@@ -56,7 +54,7 @@ echo            7/udp
 discard         9/udp           sink null
 ```
 
-Here, you can see use of optional last two fields as well. `discard` service has alternate name as `sink` or `null`.
+在这里，你可以看到可选的最后两个字段的用处。`discard` 服务的别名为 `sink` 或 `null`。
 
 --------------------------------------------------------------------------------
 
@@ -64,7 +62,7 @@ via: https://kerneltalks.com/linux/understanding-etc-services-file-in-linux/
 
 作者：[kerneltalks][a]
 选题：[lujun9972][b]
-译者：[译者ID](https://github.com/译者ID)
+译者：[MjSeven](https://github.com/MjSeven)
 校对：[校对者ID](https://github.com/校对者ID)
 
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