#!/bin/bash

# Simple PID to PS resolver

pid=$1
if [[ -z $pid  ]]; then
    echo "[*] Usage: pid2ps <PID>"
    exit 1
fi

if [[ $pid =~ ^[0-9]+$ ]]; then
    if name=$(/bin/cat /proc/$pid/comm 2>/dev/null); then
        echo $name
    else
        echo "[!] No such process"
        exit 1
    fi
else
    echo "[!] Invalid PID"
    exit 1
fi