[POSIBLESPAM]: [GRASS-user] test if raster/vector exists (in Perl)

Hamish hamish_nospam at yahoo.com
Tue Aug 14 20:46:50 EDT 2007

Mark wrote:
> I have a Perl program that loops through the r.lake module, and
> captures output.  In the program, there are a few instances where I
> would like to test if a given raster already exists.  In perl, its
> something like this to test if a file exists ... if (-e "filename") {
> do stuff }.

José Antonio Ruiz Arias wrote:
> Try with ‘g.findfile element=cell file=<your_raster_name>’ in a Perl
> pipe. If the module returns a series of empty strings, your raster
> does not exist.

You can also test g.findfile's return code, it returns 0 if the file was
found, 1 if not.


More information about the grass-user mailing list