OLD BUGGY IMPLEMENTATION - Show processes lifecycle in real time

live_processes.sh

#!/bin/sh

get_running_processes() {
    processes=$(ps -eo ppid,pid,cmd)
    echo "$processes" |
      grep -v "\[.*\]" | # Filter out kernel processes
      awk -v pid="$$" '$1 != pid' | # Remove children of current script
      awk '{print $1 " " $2 " " $3}' | # Remove ppid + command params
      sort
}

draw_left() { # Takes stopped processes as argument
    tput cup 0 0
    echo "Stopped Processes:"
    for process in $1; do
        echo $process
    done
}

RIGHT=$(( $(tput cols) / 2 ))
draw_right() {
    tput cup 0 $RIGHT
    echo "Created Processes:"
    i=1
    for process in $1; do
        tput cup $i $RIGHT
        echo $process
        i=$((i + 1))
    done
}

IFS=$'\n'

running_processes=$(get_running_processes)
while true; do
    # Wait for 1 second
    sleep 1

    # Get the updated list of running processes
    updated_processes=$(get_running_processes)

    # Process to get the wanted data
    stopped_processes=$(comm -13 <(echo "$running_processes") <(echo "$updated_processes"))
    created_processes=$(comm -23 <(echo "$running_processes") <(echo "$updated_processes"))

    # Print to screen
    clear
    draw_left "$stopped_processes"
    draw_right "$created_processes"

    # Update list
    running_processes=$updated_processes
done