Re: Why does grep [^0-9] become grep u?

[Matthew Woehlke]

David Liontooth wrote:
> In two windows of the same KDE konsole, I get this:
>
> $ echo aa | strace grep [^0-9]
> execve("/bin/grep", ["grep", "u"], [/* 31 vars */]) = 0
> [snip]

(expanding on Andreas' answer...)
[^0-9] is being interpreted by your shell (probably bash) as a globbing 
sequence that matches any files whose name is a single character that is 
not a digit. If there are no matches, the glob is passed unaltered, 
otherwise it is expanded. You probably meant to write "grep '[^0-9]'" 
(note the single quotes!) to prevent shell expansion. It is ALWAYS good 
practice to properly quote arguments.

--
Matthew
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