Microsoft BASIC for Atari 400 and Atari 800 (which is distinct from the Atari BASIC that shipped with those computers) had a `RENUM` command that would renumber

Microsoft BASIC for Atari 400 and Atari 800 (which is distinct from the Atari BASIC that shipped with those computers) had a `RENUM` command that would renumber lines. New line numbers would start at 10 and increment by 10. Those defaults could be overridden. https://archive.org/details/a8b_Atari_800_Basic_v1.0_1981_Microsoft https://archive.org/details/a8b_Atari_800_Basic_v1.0_1981_Mi...