sysmon

#!/bin/bash
# How to Check Memory Usage Per Process on Linux: https://linuxhint.com/check_memory_usage_process_linux/
# @AUTHOR: Shahriar Shovon

printf "%-10s%-15s%-15s%s\n" "PID" "OWNER" "MEMORY" "COMMAND"

sysmon_main() {
    # The fisrt command I am going to run will give me the [PID], [OWNER] and [COMMAND] of all the running processes
    # separated by colon (:) symbol and store it in the RAWIN variable. Then loop through the output and print it on
    # the screen.
    RAWIN=$(ps -o pid,user,%mem,command ax | grep -v PID | sort -bnr -k3 | awk '/[0-9]*/{print $1 ":" $2 ":" $4}')

    for i in $RAWIN
    do
        # Delimited information in separate variables.
        PID=$(echo $i | cut -d: -f1)
        OWNER=$(echo $i | cut -d: -f2)
        COMMAND=$(echo $i | cut -d: -f3)
        MEMORY=$(sudo pmap $PID | tail -n 1 | awk '/[0-9]K/{print $2}') # Fetch memory usage of each PID.

        printf "%-10s%-15s%-15s%s\n" "$PID" "$OWNER" "$MEMORY" "$COMMAND"
    done
}

sysmon_main | sort -bnr -k3