unix for idiots by an idiot...

Useful unix commands with the aim of being useful and concise
Shell scripting in bash again, useful and concise. These are the things I quite often forget myself, so writing them here helps me remember exactly how you do sums in shell scripts and so on.
Redirecting standard error and output in bash

useful pages elsewhere that i look at occasionally...

find from learning unix by example, quite a handy site.
vim regular expressions 101 very useful reference.
gnuplot tips - japanese site with an english translation and the best gnuplot help page i have found.