Get the same information from the command line

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.