Updated the wiki with this information.
https://wiki.galaxyproject.org/Admin/Tools/ToolConfigSyntax#A.3Cversion_command.3E_tag_set.

We got to get away from using the wiki page and start documenting this
stuff in the XSD (https://github.com/JeanFred/Galaxy-XSD) directly and
build the documentation from that. Maybe Eric or Björn will find a
couple free hours some day to get that wiki information ported over
:).

Thanks for the catch Peter,
John

On Tue, Sep 1, 2015 at 11:43 AM, Peter Cock <p.j.a.c...@googlemail.com> wrote:
> Hello all,
>
> I've just noticed that dollar signs for accessing environment
> variables must be escaped in the XML <command> tag,
> but must not be escaped in the <version_command> tag:
>
> https://github.com/peterjc/pico_galaxy/commit/4613a08139a3dfa07c3b0411ac8a91f55deabb74
>
> I presume this is because <command> is parsed as a
> Cheetah template where dollar means a Python variable
> (like the input and output parameters), while for the
> <version_command> this does not happen?
>
> Has anyone else been caught out by this? Is it worth adding
> a note about this to the wiki?
> https://wiki.galaxyproject.org/Admin/Tools/ToolConfigSyntax
>
> Regards,
>
> Peter
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