system utilities
diverse commando's, hun gebruik en voorbeelden ...
usefull commands: du , at, watch, tail -f, ls -lt | head
logs: /var/log, logrotate, zless, zgrep, .. dmesg, journalctl
kernelmodules: lsmod, depmod, modprobe, ..
filesystem: dd, debugfs, fsck, ... tune2fs
terminal: ... screen, tmux
redirection en piping: tee, named pipes http://www.catonmat.net/blog/bash-one-liners-explained-part-three/
networking: netcat, iwconfig ...