GNU bug report logs - #56453
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Message #19 received at 56453 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: GUI <1678556598 <at> qq.com>
Cc: 56453 <at> debbugs.gnu.org
Subject: Re: 回复： 回复： bug#56453: Bug reports
Date: Sat, 9 Jul 2022 13:24:09 -0500

On 7/9/22 05:16, GUI wrote:
> Thank you very much.I think there are something wrong with my expression.
>
> grep Download
>
> When you type something, hitting grep will do a row match
>
> The "grep Download" command has no file.So it is the case that"If no FILE is given, recursive searches examine the working  directory,  and nonrecursive searches read standard input. ".
>
> When I type the command,the terminal will do two things which are 'recursive searches Examine the working directory' and 'nonrecursive searches read standard input'.In this case, Download should be used as a matching string, but instead of going through all the files in the current directory, the terminal waits for the user's input.
>
> So I think it's a little different from what you wrote.
>

Plain "grep Download" does not use -r, so it's not recursive. Also, it 
specifies no FILE operands, so the sentence you quoted applies, and it 
searches standard input (in this case, the terminal).

The command "grep -r Download", in contrast, is nearly equivalent to 
"grep -r Download .". That is, it recursively searches the working 
directory, ignoring standard input.

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