root@OpenWrt:~# df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/mtdblock1            7168      2596      4572  36% /
tmpfs                      512         0       512   0% /dev
root@OpenWrt:~#

root@OpenWrt:~# free
              total         used         free       shared      buffers
  Mem:        13632         7992         5640            0            0
 Swap:            0            0            0
Total:        13632         7992         5640
root@OpenWrt:~#