STATA: Mass renaming variables

Have a bunch of variables with the same beginning of their name, but you want them to be named something else? E.g.
pop1961
pop1962
pop1963

You could -reshape long-, then -rename-, then -reshape wide-, but that's ugly, takes forever, will generate missing values if you don't have all the years, doesn't work for things not years, etc. etc.

Instead, try:
-renpfix-

E.g. -renpfix pop mom-

Now you've got:
mom1961
mom1962
mom1963