A command that replicates a many-to-one merge with keep(1 3) and nogen options in fewer characters.
The following commands are therefore equivalent:
merge m:1 varlist using filename, keep(1 3) nogen
pullin varlist using filename
available to install from the SSC! via ssc install pullin
honestly, I just got tired of typing m:1 , keep(1 3) nogen for every single merge I ran in the Record Linking Lab, so here's this