Is your system really Unix if it doesn't have fort77(1) or ed(1)?
@avalos fort77 is the FORTRAN 77 compiler that's mandated by POSIX and actually used to be as standard as a C compiler. if you're wondering where the naming convention came from, POSIX also mandates a c99.
ed is unironically good for small edits and such even if I'd never write source code in it.
masto instance for the tildeverse