g.search.modules keyword=buffer,clip

r.circle
    keywords: raster,buffer,geometry,circle
    description: Creates a raster map containing concentric rings around a
                 given point.

r.buffer.lowmem
    keywords: raster,buffer
    description: Creates a raster map showing buffer zones surrounding cells
                 that contain non-NULL category values. This is the low-
                 memory alternative to the classic r.buffer module.

r.buffer
    keywords: raster,buffer
    description: Creates a raster map showing buffer zones surrounding cells
                 that contain non-NULL category values.

g.search.modules keyword=clip,overlay -a -c

v.overlay
    keywords: vector,geometry,spatial query,intersection,union,clip
    description: Overlays two vector maps.;

g.search.modules -m keyword=kapri

db.execute
    keywords: database,attribute table,SQL
    description: Executes any SQL statement. For SELECT statements use
                 'db.select'.

db.select
    keywords: database,attribute table,SQL
    description: Selects data from attribute table. Performs SQL query
                 statement(s).