[GRASS-dev] Dash vs Bash changes in GRASS GIS

Markus Neteler neteler at osgeo.org
Mon Dec 9 00:22:32 PST 2013

On Sun, Dec 8, 2013 at 11:50 PM, Rashad M <mohammedrashadkm at gmail.com> wrote:
> Hi all,
> Will the shell change to dash from bash in linux affect any GRASS startup
> scripts now ? Are they all ported to dash?

Note that dash is Ubuntu specific (and/or Debian, no idea).

For example, on Fedora there is
/bin/sh -> bash

> Most of scripts worked with bash
> doesn't work with dash and Ubuntu changed to dash by default. So when
> referring to /bin/sh its actually /bin/dash and loops and some increment
> operators wont work with dash.

The overall idea in GRASS is to avoid bash-isms at all and to stick to Bourne
shell syntax.

> So does GRASS GIS sets its shell to be
> bash/dash shell instead of /bin/sh which in some distro maybe bash and dash
> in others.

While ideally all scripts should be Bourne shell a few are explicitely
bash scripts [1] or not properly ported (in case to be fixed!).


[1] result of find/grep in G65:
./mswindows/osgeo4w/msys.bat:start "%WD%mintty" /bin/bash -l
./lib/init/init.sh:    export SHELL=/usr/bin/bash.exe

--> essentially only r.tileset and i.spectral

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