Once per minute, collect process CPU and memory-usage in CSV format

monitor_pid.sh

#!/bin/bash

# Given a process ID, print time,%cpu,%mem,vsz,rss in CSV format once per minute.

# Check if PID is provided
if [ -z "$1" ]; then
    echo "Usage: $0 <PID>"
    exit 1
fi

PID=$1

echo 'timestamp,%cpu,%mem,vsz,rss'

while true; do
    # Get the current time in ISO 8601 format
    TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")

    # Run the ps command and format the output
    ps -p $PID -ww -O %cpu,%mem,vsz,rss | sed '1d' | awk -v timestamp="$TIMESTAMP" '{print timestamp","$2","$3","$4","$5}'

    # Sleep for 60 seconds
    sleep 60
done