Monitor linux system performance using default tools in linux operating system.
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top - Display all linux running linux process
Top command provides you the real-time process or threads currently managed by linux kernel.
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htop - Simllar to top
you can see all the processes running on the system, along with their full command lines, as well as viewing them as a process tree, selecting multiple processes and acting on them all at once
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lsof - Lists all open files belonging to all active processes
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ps - Report a snapshot of the current processes.
ps -A to select all the process.
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uptime - Tell how long the system has been running.
Uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.