System and process monitoring

uptime	show current uptime
df	show disk usage
du	show directory space usage
free	show memory and swap usage
ps	show all current active processes
top	task manager program displays information about CPU and memory utilization
kill pid	kill process with process id pid
bg	list stopped or background jobs
lsof	Lists all files opened by any process of a system
lsof -u user1	Lists all files opened by user1

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