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-Linux终端：用cat命令查看隐藏的字符
-================================================================================
-Sometimes a program or software don’t start for a syntax error, and if you check the files there is nothing wrong..apparently.
-There are a lot of characters that usually are not printed if you use a normal text editor, but you can easily check if they are present with your terminal and the command cat.某些时候，一个程序或软件并没有语法错误，并且你检查它的相关文件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。
-
-As first thing let’s create a simple text file with these special characters, open a terminal and run the command: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
-
-Now if you open the file with an editor you’ll have different results.
-A simple cat will show:
-
-    $ cat /tmp/testing.txt 
-    testing
-    		testing
-     
-    more testing
-     
-    even more testing
-    
-While if you open it with nano or vim you’ll see :
-
-    testing
-                testing^L^H
-
-    more testing
-        ^@^K^@even more testing
-
-Now we can see some options of cat to print special characters.
-
-1) Use cat -T to display TAB characters as ^I
-
-    cat -T /tmp/testing.txt
-    testing
-    ^I^Itesting
-     
-    more testing
-    ^I
-      even more testing
-    ^I^I^I
-
-2) Use cat -E to display $ at end of each line
-
-    $ cat -E /tmp/testing.txt
-    testing$
-    		testing
-      $
-    more testing$
-     
-    even more testing$
-    			$
-
-3) Use a simple cat -A to show up all the invisible characters:
-
-    $ cat -A /tmp/testing.txt
-    testing$
-    ^I^Itesting^L^H$
-    more testing$
-    ^I^@^K^@even more testing$
-    ^I^I^I$
-
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-
-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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