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Subject: Re: sh -c and newline
References: <91DCAC3CB99C724EB365BB64677FBE7B1007BC AT MX204CL04 DOT corp DOT emc DOT com>
To: cygwin AT cygwin DOT com
Reply-To: Brian DOT Inglis AT SystematicSw DOT ab DOT ca
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Message-ID: <e2de2246-20ad-308b-e6b1-20804163ef51@SystematicSw.ab.ca>
Date: Mon, 5 Dec 2016 13:03:40 -0700
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On 2016-12-05 12:38, Gluszczak, Glenn wrote:
> I can't seem to get sh -c to recognize newline. Tcsh -c works.
> I'm using echo as an example but I'm actually trying to build a
> here-document.
> %%%sh -c  "echo \nhello"
> nhello
> %%%sh -c  "echo \\nhello"
> nhello
> %%%sh -c  "echo \\\nhello"
> \nhello
> %%%tcsh -c  "echo \nhello"
> nhello
> %%%tcsh -c  "echo \\nhello"
> \nhello
> %%%tcsh -c "echo \\\nhello"
> hello

Your login shell is scanning and interpreting escapes in the input, 
then the subshell you are running, so you need to quote \n to let 
echo see it. Builtin echo does not recognize escapes without -e.
You can use echo -e, or $ prefix a single quoted string to have the 
shell interpret the escape sequence.

$ sh -c "echo -e '\nhello'"

hello
$ sh -c "echo $'\n'hello"

hello
$ sh -c "echo $'\nhello'"

hello

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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