efficient way of running proc at a given time, that can be changed

[janAkali]

Another option is to use the 'at' linux tool - 
<https://man7.org/linux/man-pages/man1/at.1p.html>

> at, batch, atq, atrm - queue, examine, or delete jobs for later execution

A couple fun examples allowed by extended POSIX.2 timespec:
    
    
    at now + 1 hour <<< "touch ~/file"
    at teatime 23-08-23 <<< "touch ~/file"
    at 4pm thursday + 10 minutes <<< "touch ~/file"
    
    
    Run