Linux: The detailed information about your computer's trademark, hardware, etc.

1 - CPU Information
[TERMINAL] >> cat/proc/cpuinfo
2- RAM Information
[TERMINAL] >> cat/proc/meminfo
3 - hda Information
[TERMINAL] >> dmesg|grep "^hda"
4 - hdd Information
[TERMINAL] >> dmesg|grep "^hdd"
5 - USB audio card Information
[TERMINAL] >> dmesg|grep usb
6 - PCI devices Information
[TERMINAL] >> lspci