Generic bash script stuff

generic.sh

#!/usr/bin/env bash

# Exit script when command fails
set -o errexit
# Exit when script tries to use undeclared variable
set -o nounset
# Exit if piped command fails
set -o pipefail
# aka:
# set -euo pipefail


BASEDIR="$( cd "$(dirname "$0")" ; pwd -P )"

MY_CMDNAME=${0##*/}
echoerr() { echo "$@" 1>&2; }

CPU_CORES=$(getconf _NPROCESSORS_ONLN 2>/dev/null || grep -c ^processor /proc/cpuinfo 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || 1)

TMP_OUTPUT_FILE="$(mktemp)"
TMP_OUTPUT_DIR="$(mktemp -d)"
function cleanup() {
  rm -f "$TMP_OUTPUT_FILE"
  rm -rf "$TMP_OUTPUT_DIR"
}
trap cleanup SIGINT
trap cleanup ERR


# Fancy colors
blu="\e[94m"   # Light Blue
red="\e[1;91m" # Bold Red
clr="\e[0m"    # Reset
function printok() {
  printf "✅ ${blu}%s${clr}\n" "$*"
}
function printerr() {
  printf "❌ ${red}%s${clr}\n" "$*"
}

printok "OMENS ARE GOOD 😀"
printerr "Weather is bad :-("