Check Hareware in Linux

Here're the commands:

For getting CPU, memory, paging, just "cat" the /proc files:

• cat /proc/cpuinfo
• cat /proc/meminfo
• cat /proc/swaps
  

For getting "lower level" information such as PCI, USB:

• lspci (list PCI)
  
• lsusb (list USB devices)
  
• lshw

More:

• lsdev
• dmidecode
• biosdecode
• vpddecode