[linux]how to view the hardware info

• product info
• dmidecode  | more

• count of physical CPU
• # grep 'physical id' /proc/cpuinfo | sort | uniq | wc -l

•  count of logica CPU 
• # grep ^processor /proc/cpuinfo | wc -l

• count of core
• # grep 'cpu cores' /proc/cpuinfo

• meminfo
• cat /proc/meminfo

• disk 정보
• fdisk -l | grep Disk