The Unix Programming Environment is a book you can't read too soon. It's something I wish I'd come across years before I actually did. An authoritative and comprehensive manual for using Unix as a programmer, it clearly explains concepts such as inodes, hard and soft links, system calls, and the power of joining programs together via stdin and stdout. By the time I came across this book I already knew these concepts, but had never studied them before in one place, and in such a coherent manner.
It says how long ago something was said, so you can tell last month
from 2014 without doing the arithmetic. Full and green is recent; it
drains and cools as the date gets older, and empties completely at about
6 years.
5d5 days ago
8mo8 months ago
2yr2 years ago
4yr4 years ago
9yr9 years ago
A striped bar means the date itself is an estimate — the source did
not carry an exact one. An entry with no date at all gets no bar.