list memory usage of application in ubuntu

$ ps euf

If I run free -m I get

             total       used       free     shared    buffers     cached
Mem:           496        489          6          0          4        452
-/+ buffers/cache:         33        462
Swap:          511          4        507
 
If I run ps euf I get

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root       948  0.0  0.0   5928   472 tty6     Ss+  Aug25   0:00 /sbin/getty 384
root       947  0.0  0.0   5928   472 tty5     Ss+  Aug25   0:00 /sbin/getty 384
root       946  0.0  0.0   5928   472 tty4     Ss+  Aug25   0:00 /sbin/getty 384
root       945  0.0  0.0   5928   472 tty3     Ss+  Aug25   0:00 /sbin/getty 384
root       944  0.0  0.0   5928   472 tty2     Ss+  Aug25   0:00 /sbin/getty 384
root       943  0.0  0.1  51856   536 hvc0     Ss   Aug25   0:00 /bin/login -- 
root       978  0.0  0.4  20580  2424 hvc0     S    Aug25   0:01  \_ -bash TERM=
root      7593  0.0  0.1  10332   524 hvc0     T    Aug25   0:00      \_ nano he
root     12576  0.7  3.1 122520 16220 hvc0     Sl   07:42   0:12      \_ ./mongo
root     12599  0.0  0.2  16300  1060 hvc0     R+   08:09   0:00      \_ ps euf
 
 
 
Note: Some forums say 
 
The command ps euf does not list all the processes - you should use ps axeuf for that.

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