Re: optim, struct, parallel: pre-release check on Windows?

[Olaf Till]

On Fri, Apr 15, 2016 at 09:04:12AM -0700, Mike Miller wrote:
> On Fri, Apr 15, 2016 at 17:42:31 +0200, Olaf Till wrote:
> > It was a mistake of mine, and now I see that echo needs this switch
> > even at my system. As soon as I have time I'll have to figure out why
> > the Makefile worked for me at all.
> 
> Because this is one of those non-portable shell things that vary wildly
> depending on your environment :)
> 
> Try these:
> 
>   dash -c 'echo "line 1\nline 2\n"'
>   bash -c 'echo "line 1\nline 2\n"'
>   bash -c 'shopt -s xpg_echo; echo "line 1\nline 2\n"'
>   /bin/echo "line 1\nline 2\n"
> 
> The -e option to echo is not portable:
> 
>   dash -c 'echo -e "line 1\nline 2\n"'
> 
> The safest practice is to assume that echo produces undefined output
> when it encounters a backslash. If you want multiple lines of output,
> just do multiple echo commands. If you want other escape sequences like
> a tab, use the printf command instead.

Very instructive, thank you. This spares me a lot of time and maybe
further mistakes.

Olaf

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