http://sourceforge.net/projects/nmon

x   Use these keys to toggle statistics on/off:                      
x     c = CPU         l = CPU Long-term     - = Faster screen updates
x     C = " WideView  U = Utilisation       + = Slower screen updates
x     m = Memory      V = Virtual memory    j = File Systems         
x     d = Disks       n = Network           . = only busy disks/procs
x     r = Resource    N = NFS               h = more options         
x     k = Kernel      t = Top-processes     q = Quit

-f            spreadsheet output format [note: default -s300 -c288]
              output file is <hostname>_YYYYMMDD_HHMM.nmon