linux-system-commands.md

• cat /etc/os-release

  It returns Name, Version, ID, Pretty_Name and other details

• sysctl -a

  It returns all available Kernel Parameters

• lscpu

  It returns CPU Architecture Information

• cat /proc/cpuinfo | grep processor

  It returns the number of available processors

• cat /proc/cpuinfo |grep cpu\ cores |uniq

  It returns the number of available cores

• lshw

  It returns hardware details

• df -kh

  It returns details of available disk and their sizes

• free -m

  It returns memory details in MB

• ps aux | awk '{print $2, $4, $11}' | sort -k2rn | head -n 20

  It returns top 20 memory eating processes

• facter virtual
• cat /proc/scsi/scsi
• ethtool -i eth0
• dmidecode | grep -i vmware

  It tells whether this host is virtual or physical