[GRASS-dev] Re: [GRASS-SVN] r34913 - grass/branches/develbranch_6/general/g.gisenv

GRASS GRASS developer
1

On Tue, Dec 16, 2008 at 3:33 PM, <svn_grass@osgeo.org> wrote:

Date: 2008-12-16 09:33:27 -0500 (Tue, 16 Dec 2008)
New Revision: 34913

Modified:
  grass/branches/develbranch_6/general/g.gisenv/main.c
Log:
g.gisenv: -s/n flags added (merge from trunk)

...

+ flag_s = G_define_flag();
+ flag_s->key = 's';
+ flag_s->description = _("Use shell syntax (for \"eval\")");
+
+ flag_n = G_define_flag();
+ flag_n->key = 'n';
+ flag_n->description = _("Don't use shell syntax");
+

Is -n really needed?

GRASS 6.4.svn (spearfish60): > g.gisenv
GISDBASE=/home/neteler/grassdata
LOCATION_NAME=spearfish60
MAPSET=neteler
DEBUG=0
GRASS_GUI=text

GRASS 6.4.svn (spearfish60): > g.gisenv -s
GISDBASE='/home/neteler/grassdata';
LOCATION_NAME='spearfish60';
MAPSET='neteler';
DEBUG='0';
GRASS_GUI='text';

GRASS 6.4.svn (spearfish60): > g.gisenv -n
GISDBASE=/home/neteler/grassdata
LOCATION_NAME=spearfish60
MAPSET=neteler
DEBUG=0
GRASS_GUI=text

Isn't -n superfluous?

Markus

2

Markus Neteler wrote:

On Tue, Dec 16, 2008 at 3:33 PM, <svn_grass@osgeo.org> wrote:
> Date: 2008-12-16 09:33:27 -0500 (Tue, 16 Dec 2008)
> New Revision: 34913
>
> Modified:
> grass/branches/develbranch_6/general/g.gisenv/main.c
> Log:
> g.gisenv: -s/n flags added (merge from trunk)
...
> + flag_s = G_define_flag();
> + flag_s->key = 's';
> + flag_s->description = _("Use shell syntax (for \"eval\")");
> +
> + flag_n = G_define_flag();
> + flag_n->key = 'n';
> + flag_n->description = _("Don't use shell syntax");
> +

Is -n really needed?

Yes.

GRASS 6.4.svn (spearfish60): > g.gisenv
GISDBASE=/home/neteler/grassdata
LOCATION_NAME=spearfish60
MAPSET=neteler
DEBUG=0
GRASS_GUI=text

GRASS 6.4.svn (spearfish60): > g.gisenv -s
GISDBASE='/home/neteler/grassdata';
LOCATION_NAME='spearfish60';
MAPSET='neteler';
DEBUG='0';
GRASS_GUI='text';

GRASS 6.4.svn (spearfish60): > g.gisenv -n
GISDBASE=/home/neteler/grassdata
LOCATION_NAME=spearfish60
MAPSET=neteler
DEBUG=0
GRASS_GUI=text

Isn't -n superfluous?

No.
  $ g.gisenv
  GISDBASE=/opt/grass-data
  LOCATION_NAME=spearfish57
  MAPSET=glynn
  GRASS_GUI=text
  
  $ g.gisenv | cat
  GISDBASE='/opt/grass-data';
  LOCATION_NAME='spearfish57';
  MAPSET='glynn';
  GRASS_GUI='text';
  
  $ g.gisenv -n | cat
  GISDBASE=/opt/grass-data
  LOCATION_NAME=spearfish57
  MAPSET=glynn
  GRASS_GUI=text

With neither -s nor -n, the default is -n if stdout is a tty and -s
otherwise (e.g. if stdout is a pipe).

The -n switch is necessary if you're parsing the g.gisenv output
within a script, and you want the "simple" format (i.e. if you're not
using bash's "eval" for parsing).

--
Glynn Clements <glynn@gclements.plus.com>