General

The Linux kernel stores all hardware settings in the virtual directory /proc.

See IO ports

cat /proc/ioports

See IRQs

cat /proc/interrupts

See PCI devices

cat /proc/pci
also
/sbin/lspci

See USB hubs and devices

cat /proc/bus/usb/devices
also
usbview (gui program)

See IDE disk settings (must be root)

hdparm /dev/hd? (hda, hdb, etc.)

View serial ports/multi-port boards (must be root)

setserial /dev/ttyS0 setserial /dev/ttyS1

Active network cards

/sbin/ifconfig
also
/sbin/ip addr

Boot time hardware detection messages (kernel ring buffer)

dmesg | less