NAME
g.findfile - Searches for GRASS data base files and sets variables for the shell.
KEYWORDS
general,
map management,
scripts
SYNOPSIS
g.findfile
g.findfile --help
g.findfile [-nl] element=string file=string [mapset=string] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -n
- Do not add quotes
- -l
- List available elements and exit
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- element=string [required]
- Name of an element
- file=string [required]
- Name of an existing map
- mapset=string
- Name of a mapset (default: search path)
- '.' for current mapset
g.findfile is designed for Bourne shell or Python scripts
that need to search for mapset
elements, including: raster,
vector maps, region definitions
and
imagery groups.
The list of element names to search for is not fixed; any
subdirectory of the mapset directory is a valid element name.
However, the user can find the list of standard GRASS element
names in the file $GISBASE/etc/element_list. This is the file
which g.remove, g.rename
and g.copy use to determine which files
need to be deleted/renamed/copied for a given entity type.
g.findfile writes four lines to standard output:
name='file_name'
mapset='mapset_name'
file='unix_filename'
fullname='grass_fullname'
The output is
Bash commands to set the variable
name to the GRASS data base file name,
mapset to the mapset in which the file resides,
and
file to the full UNIX path name for the named
file. These variables may be set in the
Bash
as follows:
eval `g.findfile element=name mapset=name file=name`
Raster map example:
eval `g.findfile element=cell file=elevation`
If the specified file (here: raster map) does not exist, the variables
will be set as follows:
name=
mapset=
fullname=
file=
The following is a way to test for this case:
if [ ! "$file" ]
then
exit 1
fi
Vector map example (including error message):
eval `g.findfile element=vector file="$G_OPT_V_INPUT"`
if [ ! "$file" ] ; then
g.message -e "Vector map <$G_OPT_V_INPUT> not found"
exit 1
fi
See
Python
Scripting Library for more info.
Note: The Python tab in the wxGUI can be used for entering the
following code:
import grass.script as gcore
gcore.find_file('elevation', element = 'cell')
g.filename,
g.gisenv,
g.mapsets,
g.parser
Michael Shapiro,
U.S.Army Construction Engineering Research Laboratory
SOURCE CODE
Available at:
g.findfile source code
(history)
Latest change: Wednesday Nov 27 22:53:26 2024 in commit: b90ce69e88409469369ec1edb86fde8ec822af8b
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual