From 587c5337839a7941116475a51b1b75c69c40c174 Mon Sep 17 00:00:00 2001
From: runningwater <ynwdlxm@163.com>
Date: Tue, 15 Oct 2013 22:50:11 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BF=BB=E8=AF=91=E5=AE=8C=E6=88=90?=
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+Linux终端：用cat命令查看隐藏的字符
+================================================================================
+时常，某个程序或软件并没有语法错误，并且你检查它的相关内容也确实没有发现问题。这是因为你用普通文本编辑器软件来查看的时候，有许多字符没有显示出来，但在终端下面使用cat命令可以很容易的检测出是否存在这些字符。
+
+首先，我们创建一个简单的文本文件，写入一些特殊的字符。打开终端，运行命令：
+
+    printf 'testing\012\011\011testing\014\010\012more testing\012\011\000\013\000even more testing\012\011\011\011\012' > /tmp/testing.txt
+
+现在用不同的编辑器软件打开，显示的结果不会相同。用简单的cat打开将显示：
+
+    $ cat /tmp/testing.txt 
+    testing
+    		testing
+     
+    more testing
+     
+    even more testing
+    
+然而用nano或者vim打开，将会看到：
+
+    testing
+                testing^L^H
+
+    more testing
+        ^@^K^@even more testing
+
+现在我们给cat加上一些选项参数，以便能显示出特殊字符来。
+
+1) 用cat -T命令来显示TAB键的字符^I
+
+    cat -T /tmp/testing.txt
+    testing
+    ^I^Itesting
+     
+    more testing
+    ^I
+      even more testing
+    ^I^I^I
+
+2) 用cat -E命令来显示行尾的结束字符$
+
+    $ cat -E /tmp/testing.txt
+    testing$
+    		testing
+      $
+    more testing$
+     
+    even more testing$
+    			$
+
+3) 用简单的cat -A命令就可以显示所有不可见的字符：
+
+    $ cat -A /tmp/testing.txt
+    testing$
+    ^I^Itesting^L^H$
+    more testing$
+    ^I^@^K^@even more testing$
+    ^I^I^I$
+
+--------------------------------------------------------------------------------
+
+via: http://linuxaria.com/pills/linux-terminal-seeing-the-unseen-characters-with-cat?lang=en#more-7645
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
+
+译者：[runningwater](https://github.com/runningwater) 校对：[校对者ID](https://github.com/校对者ID)
+
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