process_monitor.sh

#!/bin/bash
# Color codes for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color
# Initialize variables
JSON_OUTPUT=false
LOG_FILE=""
SILENT=false
PROCESS_LIST=()
# Parse command line arguments
while [[ "$#" -gt 0 ]]; do
    case $1 in
        --json) JSON_OUTPUT=true ;;
        --log-file) LOG_FILE="$2"; shift ;;
        --silent) SILENT=true ;;
        *) PROCESS_LIST+=("$1") ;;
    esac
    shift
done
# Show usage if no processes specified
if [[ "${#PROCESS_LIST[@]}" -eq 0 ]]; then
    echo "Usage: $0 [OPTIONS] <process1> <process2> ..."
    echo "Options:"
    echo "  --json              Output in JSON format"
    echo "  --log-file FILE     Log results to a file"
    echo "  --silent            Suppress terminal output"
    exit 1
fi
# Get system information
if [[ "$(uname)" == "Darwin" ]]; then
    # macOS detection
    DISTRO="macOS $(sw_vers -productVersion)"
    PS_CMD="ps -p %s -o pid=,user=,command="
else
    # Linux detection
    DISTRO=$(grep '^NAME=' /etc/os-release | cut -d'"' -f2 2>/dev/null || uname -s)
    PS_CMD="ps -p %s -o pid=,user=,cmd= --no-headers 2>/dev/null || ps -p %s -o pid=,user=,command= --no-headers"
fi
HOSTNAME=$(hostname)
TIMESTAMP=$(date +'%Y-%m-%d %H:%M:%S')
# Initialize JSON output if enabled
if $JSON_OUTPUT; then
    JSON_RESULT="{ \"hostname\": \"$HOSTNAME\", \"timestamp\": \"$TIMESTAMP\", \"os\": \"$DISTRO\", \"processes\": ["
fi
SCRIPT_PID=$$
SCRIPT_NAME=$(basename "$0")
# Function to get process information (cross-platform)
get_process_info() {
    local pid="$1"
    if [[ "$(uname)" == "Darwin" ]]; then
        # macOS ps format
        ps -p "$pid" -o pid=,user=,command= | awk '{$1=$1;print}'
    else
        # Linux ps format
        eval $(printf "$PS_CMD" "$pid" "$pid")
    fi
}
# Main process checking loop
for pattern in "${PROCESS_LIST[@]}"; do
    # Find matching processes excluding this script
    if [[ "$(uname)" == "Darwin" ]]; then
        # macOS pgrep syntax
        pids=$(pgrep -f "$pattern" | grep -vw "$SCRIPT_PID")
    else
        # Linux pgrep syntax
        pids=$(pgrep -f "$pattern" | grep -vw "$SCRIPT_PID")
    fi
    if [[ -n "$pids" ]]; then
        status="RUNNING"
        color="$GREEN"
        details=""
        while read -r pid; do
            process_info=$(get_process_info "$pid")
            details+="$process_info\n"
        done <<< "$pids"
    else
        status="NOT RUNNING"
        color="$RED"
        details="No matching process found"
    fi
    # Terminal output (unless silent mode)
    if ! $SILENT; then
        if ! $JSON_OUTPUT; then
            printf "%-25s ${color}%-15s${NC} %s\n" "$pattern" "$status" "$(echo -e "$details" | head -n 1)"
            [[ $(echo -e "$details" | wc -l) -gt 1 ]] && echo -e "$details" | tail -n +2
            echo "----------------------------------------------------------------"
        fi
    fi
    # JSON output (if enabled)
    if $JSON_OUTPUT; then
        if [[ -n "$pids" ]]; then
            while read -r pid; do
                process_info=$(get_process_info "$pid")
                pid_num=$(echo "$process_info" | awk '{print $1}')
                user=$(echo "$process_info" | awk '{print $2}')
                command=$(echo "$process_info" | awk '{$1=$2=""; print $0}' | sed 's/^  //')
                JSON_RESULT+="{ \"process\": \"$pattern\", \"status\": \"$status\", \"pid\": \"$pid_num\", \"user\": \"$user\", \"command\": \"$command\" },"
            done <<< "$pids"
        else
            JSON_RESULT+="{ \"process\": \"$pattern\", \"status\": \"$status\", \"pid\": null, \"user\": null, \"command\": null },"
        fi
    fi
    # Log to file (if enabled)
    if [[ -n "$LOG_FILE" ]]; then
        echo -e "[$TIMESTAMP] $pattern - $status - $(echo -e "$details" | tr '\n' ' ')" >> "$LOG_FILE"
    fi
done
# Finalize JSON output
if $JSON_OUTPUT; then
    JSON_RESULT=${JSON_RESULT%,}  # Remove trailing comma
    JSON_RESULT+=" ] }"
    if command -v jq >/dev/null 2>&1; then
        echo "$JSON_RESULT" | jq '.' 2>/dev/null
    else
        echo "$JSON_RESULT"
    fi
fi