Most of the information displayed by System Monitor can also be obtained using these command line tools.
| top | provides a continually updated list of running processes, and allows you to manipulate them. | 
| lsof | provides a list of open files and the processes that opened them. | 
| free -m | shows you how much memory is available. | 
| vmstat | provides information about current virtual memory use. | 
| df -h | displays available disk space on mounted filesystems. | 
| pmap | displays the memory map of a process. | 
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