good console bases sys monitors

[Rajinder Yadav]

Other than top, that's as far as my linux-fu gets me =P, what other 
console based monitors are you guys using that has low cpu load for 
things like:

network activity, file activity, storage space, low memory

if the system is overloaded, i'm memory leaks, errant process is there a 
monitor that will force the server to reboot? i am asking more for an 
education purpose and not any kind of immediate use

Thanks,
Rajinder
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