bug#699: grep in eshell incorrect

[Eli Zaretskii]

> From: Ted Zlatanov <tzz@lifelogs.com>
> Date: Tue, 12 Aug 2008 15:18:55 -0500
> 
> On Tue, 12 Aug 2008 21:54:29 +0300 Eli Zaretskii <eliz@gnu.org> wrote: 
> 
> >> Cc: 699@emacsbugs.donarmstrong.com,
> >> bug-gnu-emacs@gnu.org
> >> From: xah lee <xah@xahlee.org>
> >> Date: Tue, 12 Aug 2008 11:40:25 -0700
> >> 
> >> So, possibly the eshell's "ls" command forming multiple columns is a  
> >> bad design. Because after all it is supposed to emulate the unix  
> >> shell behavior and "ls | grep xyz" is common idiom.
> 
> EZ> Yes, it _is_ supposed to emulate a Unix shell.  But I just tried that
> EZ> same pipe both on GNU/Linux and on MS-Windows, and in both cases "ls"
> EZ> still forms multiple columns even in a pipe.  So I don't see anything
> EZ> wrong with how Eshell's "ls" works.
> 
> My tests show different results.

Yes, you are right: I forgot that my `ls' is aliased to "ls -x".
Under -x, the pipe doesn't imply -1.

Sorry for the confusion.