Every time you start q, it looks for a file called q.q (in
$QHOME, if defined, or current working directory otherwise). If q finds q.q, it will execute it before presenting a prompt or calling any script you provided on the command line.
If you want to call the file something else, or keep it separate from your q installation, you can set the environment variable
QINIT to the path to your initialization file.
It is also possible to add k code to q.k (which will be executed before q.q), although we’ve never needed to.