庆典：错误的行为在...循环与测试共同声明 [英] bash: wrong behavior in for... loop together with a test statement

问题描述

我想测试，如果某些文件，在TEXTFILES列表叫了起来，在某一目录中。每过一段时间（我敢肯定我每次都使用相同的语句）我得到一个错误，抱怨回声命令无法找到。

I am trying to test if certain files, called up in a list of textfiles, are in a certain directory. Every once in a while (and I am quite certain I use the same statements every time) I get an error, complaining that the echo command cannot be found.

我在我的目录 /音频/播放列表/ 根据它们所应该使用的日期命名的TEXTFILES： 20130715 .TXT 例如今天：

The textfiles I have in my directory /audio/playlists/ are named according to their date on which they are supposed to be used: 20130715.txt for example for today:

me@computer:/some/dir# ls /audio/playlists/
20130715.txt  20130802.txt  20130820.txt  20130907.txt  20130925.txt
20130716.txt  20130803.txt  20130821.txt  20130908.txt  20130926.txt
(...)

me@computer:/some/dir# cat /audio/playlists/20130715.txt
#A Comment line goes here
00:00:00 141-751.mp3
00:03:35 141-704.mp3
00:06:42 140-417.mp3
00:10:46 139-808.mp3
00:15:13 136-126.mp3
00:20:26 071-007.mp3
(...)
23:42:22 136-088.mp3
23:46:15 128-466.mp3
23:50:15 129-592.mp3
23:54:29 129-397.mp3

这么多的事实。下面的语句，这让我测试如果所有的一切在给定的目录中TEXTFILES的呼吁文件实际上是在目录的文件/音频/ MP3 / ，产生一个错误：

So much for the facts. The following statement, which lets me test if all files called upon in all of the textfiles in the given directory are actually a file in the directory /audio/mp3/, produces an error:

me@computer:/some/dir# for i in $(cat /audio/playlists/*.txt|cut -c 10-16|sort|uniq); do [ -f "/audio/mp3s/$i.mp3" ] || echo $i; done
 echo: command not found
me@computer:/some/dir#

我的猜的庆典想抱怨述评系列（实际上行）不是一个文件，但为什么会引起回声不被发现？同样，大多的这个作品，但每隔一段时间我得到这个错误。任何帮助是极大的AP preciated。

I would guess bash wants to complain about the "A Comment"-line (actually " line ") not being a file, but why would that cause echo not to be found? Again, mostly this works, but every so often I get this error. Any help is greatly appreciated.

推荐答案

在空间回声不是U + 0020是U + 00A0。事实上，命令回声不存在。

That space before echo isn't U+0020, it's U+00A0. And indeed, the command " echo" doesn't exist.

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