Monitor especific process with top

top -p `pgrep pidgin`
You can also use different process using comma: top -p `pgrep pidgin`, `pgrep python` but you have to make sure the process exists or you'll get an error
Sample Output
top - 15:33:55 up 6 days,  6:16,  3 users,  load average: 0.14, 0.14, 0.09
Tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.9%us,  0.6%sy,  0.0%ni, 98.4%id,  0.1%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   3972480k total,  3839840k used,   132640k free,   269220k buffers
Swap:  2010108k total,   119112k used,  1890996k free,  1775628k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                  
11776 cesar     20   0  567m  40m  19m S    0  1.0   0:07.14 pidgin 

0
2011-11-23 20:35:53

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