Handy commands

lspcidrake [list]
lspci -v [in depth pci device list]
lsmod [list]
ps -ef [dump process list to screen, like 'top' but not continuous]
fuser -v /dev/* [list]
ifconfig -a [same as 'ipconfig' under Windows]
service -s [show current service status]
apropos net [search man pages, in this case for all commands]
netstat -p
netstat -t
ls /proc
more /proc/meminfo
lsof [list open files]
ldd [print shared library dependencies e.g. ldd /usr/bin/perl ]
lshw [list hardware]
cal [ calendar]
modinfo [what kernel modules are listed]