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Filling in the core utilities the box was missing:
- ls -l: type, links and size, now that stat() exists. The screen is 40
columns, so it is "d 1 256 name", not the GNU sprawl. Sizes were
previously unknowable except one file at a time with wc -c.
- df: blocks and inodes, used and free, on the 32 KiB cart disk.
- mv: no rename syscall, so it is cp + rm - and the copy has to finish before
the source goes, or a failure loses the file.
- tail [-n N]: no seek syscall, so it streams the input through a ring of N
lines rather than jumping to the end. N is capped by that ring.
- tee: the missing half of a pipeline - `cat big | tee copy | wc -l`.
- sleep: the thing every script needs; the kernel counts 1/64 s ticks.
- help: lists every command the shell knows, walked out of the kernel's own
name table. The box previously had no way to tell you what it could do.
- poweroff: the only safe way to stop a gbos that has data on it. The cart's
battery RAM is written when the emulator exits cleanly, so killing it loses
the whole filesystem - it comes back "formatted". Found while testing /rc.
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