How To See Total Processes Are Running, Files Opened, Memory Used By An User?

To see all the process run by a perticular user
#ps -u username u

Example
#ps -u rajesh u

or

To see all the files opened by user
#lsof grep username

Example
#lsof grep rajesh

To see memory used by a perticular user
#ps -u username u awk '{print $2}'

Example
ps -u krishna u awk '{print $2}'

Now you will get all the PID's run by user Krishna. So try to get memory usage by using pmap command.

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