有时在我的终端（Ubuntu）上输入：
ls | grep toto
我收到此错误：
grep: command not found*
请注意，shell 正在编写以空格为前缀的 grep。这怎么可能？
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2 回答
28
<Checks the source of your original question>
<pre style="width:650px; white-space:pre-wrap">Sometimes on my terminal (Ubuntu) when I type : ls | grep toto
Thank you for copy-pasting the actual line! (But you didn't copy-paste the error message, naughty you!) See the problem? You have an unbreakable space after the pipe symbol. Shells only understand ASCII characters; all non-ASCII characters, including U+00A0 NO-BREAK SPACE, are treated as word constituents, so that unbreakable space is treated as part of the word that's in command name position.
You're presumably using a keyboard layout where you need to hold down AltGr to type |. Make sure to release the AltGr modifier so as not to accidentally type AltGr+Space instead of Space. Note that you don't need a space there, you can type ls |grep toto if that's easier on your fingers.
于 2013-11-15T12:51:22.400 回答
6
要完成 Gilles 的回答，您可以在 Ubuntu/Gnome 中禁用此行为，方法是将不可破坏的空格字符替换为键盘布局设置中的常用空格。
设置 -> 键盘 -> 布局 -> 选项，并选择“使用空格键输入不可破坏的空格字符”并将其设置为：“任何级别的常用空格”。
或者从命令行
setxkbmap -option "nbsp:none"
我在http://my.opera.com/nicomen/blog/unrecognized-character-xc2找到了这个修复。
这在 Perl 脚本的法语键盘上使用花括号或在 Python 中使用井号作为注释后跟一个空格时也很烦人。
于 2013-12-23T08:59:42.617 回答