PNU-2021.6.24

Includes:

• 2 UNIX commands:
  • basename(1) and dirname(1) - POSIX.1 / FreeBSD / GNU / Plan 9 / Inferno compatible
• 1 deprecated UNIX command:
  • prep(1) - from UNIX 7th edition
• 5 custom utilities:
  • b2bt(1), about(1), echobox(1)
  • new: ngc(1), unicode2ascii(1)
• 9 b2bt test files:
  • basename(1), dirname(1), echo(1), false(1), prep(1), true(1), yes(1)
  • new: factor(1), primes(1)