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# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2  474M  470M     0 100% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
devtmpfs        171M  4.0K  171M   1% /dev
none             47M  172K   47M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            235M     0  235M   0% /run/shm
none            100M     0  100M   0% /run/user
/dev/mmcblk0p1   11M  6.1M  5.0M  56% /boot
 
# free
             total       used       free     shared    buffers     cached
Mem:        479488     306524     172964        176       8292     260336
-/+ buffers/cache:      37896     441592
Swap:            0          0          0

prog.cpp:1:3: error: invalid preprocessing directive #df
 # df -h
   ^
prog.cpp:12:3: error: invalid preprocessing directive #free
 # free
   ^
prog.cpp:2:1: error: 'Filesystem' does not name a type
 Filesystem      Size  Used Avail Use% Mounted on
 ^

Standard output is empty