Database Reference
In-Depth Information
Youhavethencreatedabashscriptinwhichyouiteratedeverysinglecountryand
pulled out to a shapefile the clipped rivers for that country using
ogr2ogr
and the
previously created view as the input layer.
Foriteratingthecountriesinthescript,youhavebeenusing
ogrinfo
withthe
-sql
option,usingaSQL
SELECT DISTINCT
statement.Youhaveusedacombinationof
the
grep
and
awk
Linuxcommands,pipedtogethertogeteverysinglecountrycode.
The
grep
commandisautilityforsearchingplain-textdatasetsforlinesmatchinga
regularexpression,while
awk
isaninterpretedprogramminglanguagedesignedfor
text processing and typically used as a data extraction and reporting tool.
