POKE and PEEK - magical keywords available in many (1980's era) Basic languages (Apple II, TimexSinclair, TRS-80, Commodore 64) to directly write and read memory values by address.  

Much of my youth computing time was spent dutifully typing in POKE statements from computer hobbyist magazines - assembly program data entry. -- SteveYen

Prior to that era, many computers had equivalent command line facilities (or operator commands), and some still do.