How to configure sqlite to display headers by default
From the fine manual:
INIT FILE
sqlite3 reads an initialization file to set the configuration of the interactive environment. [...] If the file~/.sqlitercexists, it is processed first. can be found in the user's home directory, it is read and processed. It should generally only contain meta-commands.
So just put a file called .sqliterc in your home directory and put this in it:
.headers ON
You can pass arguments in the command line too:
sqlite3 db.db -header -column "select x from y;"