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# top

    Tasks: 111 total,   1 running, 107 sleeping,   3 stopped,   0 zombie
    Cpu(s):  4.6%us,  0.5%sy,  0.0%ni, 94.9%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
    Mem:   2062868k total,  1307380k used,   755488k free,   101964k buffers
    Swap:  2249060k total,        0k used,  2249060k free,   834628k cached

      PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
     4576 akkana    20   0  182m  89m  22m S   15  4.5   3:24.97 firefox
     3837 root      20   0  305m  27m 6848 S    3  1.4   2:27.81 Xorg
     4641 akkana    20   0  8796 5564 2372 S    0  0.3   0:04.84 xterm
    14672 akkana    20   0 26608  17m 9352 S    0  0.8   0:09.01 emacs
    20092 akkana    20   0  2444 1172  908 R    0  0.1   0:00.07 top
        1 root      20   0  1984  860  560 S    0  0.0   0:00.58 init
        2 root      15  -5     0    0    0 S    0  0.0   0:00.00 kthreadd

Here's what the basic top output looks like.

But top is a lot more flexible than that.

It's actually a surprisingly useful program.