Subject: Re: cat(1) question: multiple "-"s
To: Hubert Feyrer <firstname.lastname@example.org>
From: matthew sporleder <email@example.com>
Date: 04/18/2006 15:17:11
On 4/18/06, Hubert Feyrer <firstname.lastname@example.org> wrote:
> From cat(1):
> The cat utility reads files sequentially, writing them to the stand=
> output. The file operands are processed in command line order. A =
> dash represents the standard input, and may appear multiple times i=
> file list.
> What sense do multiple appearances of '-' make on the cat command line,
> how is that supposed to work?
I think The Right Thing should be that cat will interpret many -'s as
"output stdin where - appears"
I think the right thing is:
(file1 contains 111 and file2 contains 222)
cat - file1 - <file2
This would match the behavior of:
cat file2 file1 file2
Using multiple < redirections should not work as an array/list of
stdin's. If you want to do that, you should add options to cat to
read random filehandles, or something weird like that. (cat -&3 -&4
3<file2 4<file1 or some other weirdness)