wow! j
2008/8/6 Glynn Clements <[EMAIL PROTECTED]>: > > I have changed r.mapcalc in 7.x to use G_parser(): > > $ r.mapcalc --help > > Description: > Raster map calculator. > > Keywords: > raster > > Usage: > r.mapcalc [expression=string] [input=name] [--overwrite] [--verbose] > [--quiet] > > Flags: > --o Allow output files to overwrite existing files > --v Verbose module output > --q Quiet module output > > Parameters: > expression Expression to evaluate > input File containing expression to evaluate > > Note that, as expression= is the first option, it is the default. This > means that passing an expression on the command line is compatible > with both the old and new interfaces, so long as you: > > a) quote the expression, and > b) include a space before the first = sign. > > E.g.: > r.mapcalc "foo = 1" > or: > r.mapcalc 'foo = 1' > > An unquoted expression (i.e. split over multiple arguments) won't > work, nor will omitting the space before the = sign: > > $ r.mapcalc 'foo=1' > Sorry, <foo> is not a valid parameter > > If no options are given, it manufactures "input=-" (which reads from > stdin), so you can continue to use e.g.: > > r.mapcalc < file > or: > r.mapcalc <<EOF > foo = 1 > EOF > > But unless you need compatibility with previous versions, use input= > explicitly, e.g.: > > r.mapcalc input=file > or: > r.mapcalc input=- <<EOF > foo = 1 > EOF > > Also, it now recognises --o[verwrite] and $GRASS_OVERWRITE, so you > will get an error if you try to overwrite an existing map without one > of those. > > Note that older versions don't understand --o, so if you want to write > a shell script which is compatible with both versions, and which will > overwrite existing maps, use e.g.: > > GRASS_OVERWRITE=1 r.mapcalc 'foo = 1' > > Python scripts only need to work with 7.x, so you can just use --o (or > overwrite=True with grass.run_command etc). > > -- > Glynn Clements <[EMAIL PROTECTED]> > _______________________________________________ > grass-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-dev > -- Jachym Cepicky e-mail: jachym.cepicky gmail com URL: http://les-ejk.cz GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
