general linux ,

/usr/bin/setup - this setup is used to change keyboard,firewall,mouse,printer configuration settings.

ls /usr/bin -show all commands

• /bin : For binaries usable before the /usr partition is mounted. This is used for trivial binaries used in the very early boot stage or ones that you need to have available in booting single-user mode. Think of binaries like cat, ls, etc.
• /sbin : Same, but for scripts with superuser (root) privileges required.
• /usr/bin : Same as first, but for general system-wide binaries.
• /usr/sbin : Same as above, but for scripts with superuser (root) privileges required.
  
  
  fdisk -l - to show all hard drives
  uname -r : to see kernel version