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Re: Optimal emacs shell for coding


From: Tim X
Subject: Re: Optimal emacs shell for coding
Date: Wed, 13 Aug 2008 18:20:40 +1000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> Date: Tue, 12 Aug 2008 21:02:21 +0200
>> From: "Lennart Borgman (gmail)" <address@hidden>
>> CC: address@hidden
>> 
>> Eli Zaretskii wrote:
>> >> Date: Tue, 12 Aug 2008 20:40:35 +0200
>> >> From: "Lennart Borgman (gmail)" <address@hidden>
>> >> CC: address@hidden
>> >>
>> >> Eli Zaretskii wrote:
>> >>>> Date: Tue, 12 Aug 2008 14:06:02 +0200
>> >>>> From: "Lennart Borgman (gmail)" <address@hidden>
>> >>>> CC: address@hidden
>> >>>>
>> >>>> If you look carefully at the output you can see that what is not 
>> >>>> handled 
>> >>>> is the parameters to "ls". If you try "ls -1" it will work.
>> >>> What "parameters to ls"?  "ls" was invoked without any parameters.
>> >> If you from a shell do
>> >>
>> >>    ls | grep
>> >>
>> >> then normally ls implicitly gets the -1 parameter
>> > 
>> > No, it doesn't.  Please try and see for yourself (I just did).
>> 
>> 
>> We are miscommunicating.
>
> Maybe you are; I am not ;-)
>
>> I am saying that if I from a shell outside of Emacs do
>> 
>>    ls
>> 
>> than I get several files listed on each row while the output from
>> 
>>    ls | grep some-file
>> 
>> implies that ls got the implicit argument -1 when used in the pipe.
>
> And I'm saying that you are wrong: -1 is not implied in a pipeline
> from the shell prompt, either.  Please try that and see for yourself.
> I tried that both on GNU/Linux and in a Windows command prompt window,
> and GNU `ls' does not imply -1 in either case.
>
Exactly. An you can do another test. Just do 

ls | less

all the files are on one line each. this is standard behavior for ls if
you pipe or redirect it away from a tty. It only formats multi-column
output if the output device is a tty, unless you provide the switch to
force single column output. Note also that usually, the number of
columns is a function of the longest filename and the display width. The
concept of 'width' has no meaning with respect to stdout or when
redirecting via | or > etc.

Note that this is 'normal' behavior - if programs output multiple items
per line, it would screw up programs that you pipe into. 

Tim


-- 
tcross (at) rapttech dot com dot au


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