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+#!/bin/bash
+#
+# Template to write better bash scripts. More info: http://kvz.io
+# Version 0.01
+#
+# Usage:
+#  LOG_LEVEL=7 ./template.sh first_arg second_arg
+#
+# Licensed under MIT
+# Copyright (c) 2013 Kevin van Zonneveld
+# http://twitter.com/kvz
+#
+
+### Configuration
+#####################################################################
+
+# Environment variables
+[ -z "${LOG_LEVEL}" ] && LOG_LEVEL="6" # 7 = debug -> 0 = emergency
+
+# Commandline options. This defines the usage page, and is used to parse cli opts & defaults from.
+# the parsing is unforgiving so be precise in your syntax:
+read -r -d '' usage <<-'EOF'
+  -f   [arg] Filename to process.
+  -t   [arg] Location of tempfile. Default="/tmp/x"
+  -d         Enables debug mode
+  -h         This page
+EOF
+
+# Set magic variables for current FILE & DIR
+__FILE__="$(test -L "$0" && readlink "$0" || echo "$0")"
+__DIR__="$(cd "$(dirname "${__FILE__}")"; echo $(pwd);)"
+
+
+### Functions
+#####################################################################
+
+function _fmt ()      {
+  color_ok="\x1b[32m"
+  color_bad="\x1b[31m"
+
+  color="${color_bad}"
+  if [ "${1}" = "debug" ] || [ "${1}" = "info" ] || [ "${1}" = "notice" ]; then
+    color="${color_ok}"
+  fi
+
+  color_reset="\x1b[0m"
+  if [ "${TERM}" != "xterm" ] || [ -t 1 ]; then
+    # Don't use colors on pipes or non-recognized terminals
+    color=""
+    color_reset=""
+  fi
+  echo -e "$(date -u +"%Y-%m-%d %H:%M:%S UTC") ${color}$(printf "[%9s]" ${1})${color_reset}";
+}
+function emergency () { echo "$(_fmt emergency) ${@}" || true; exit 1; }
+function alert ()     { [ "${LOG_LEVEL}" -ge 1 ] && echo "$(_fmt alert) ${@}" || true; }
+function critical ()  { [ "${LOG_LEVEL}" -ge 2 ] && echo "$(_fmt critical) ${@}" || true; }
+function error ()     { [ "${LOG_LEVEL}" -ge 3 ] && echo "$(_fmt error) ${@}" || true; }
+function warning ()   { [ "${LOG_LEVEL}" -ge 4 ] && echo "$(_fmt warning) ${@}" || true; }
+function notice ()    { [ "${LOG_LEVEL}" -ge 5 ] && echo "$(_fmt notice) ${@}" || true; }
+function info ()      { [ "${LOG_LEVEL}" -ge 6 ] && echo "$(_fmt info) ${@}" || true; }
+function debug ()     { [ "${LOG_LEVEL}" -ge 7 ] && echo "$(_fmt debug) ${@}" || true; }
+
+function help () {
+  echo ""
+  echo " ${@}"
+  echo ""
+  echo "  ${usage}"
+  echo ""
+  exit 1
+}
+
+function cleanup_before_exit () {
+  info "Cleaning up. Done"
+}
+trap cleanup_before_exit EXIT
+
+
+### Parse commandline options
+#####################################################################
+
+# Translate usage string -> getopts arguments, and set $arg_<flag> defaults
+while read line; do
+  opt="$(echo "${line}" |awk '{print $1}' |sed -e 's#^-##')"
+  if ! echo "${line}" |egrep '\[.*\]' >/dev/null 2>&1; then
+    init="0" # it's a flag. init with 0
+  else
+    opt="${opt}:" # add : if opt has arg
+    init=""  # it has an arg. init with ""
+  fi
+  opts="${opts}${opt}"
+
+  varname="arg_${opt:0:1}"
+  if ! echo "${line}" |egrep '\. Default=' >/dev/null 2>&1; then
+    eval "${varname}=\"${init}\""
+  else
+    match="$(echo "${line}" |sed 's#^.*Default=\(\)#\1#g')"
+    eval "${varname}=\"${match}\""
+  fi
+done <<< "${usage}"
+
+# Reset in case getopts has been used previously in the shell.
+OPTIND=1
+
+# Overwrite $arg_<flag> defaults with the actual CLI options
+while getopts "${opts}" opt; do
+  line="$(echo "${usage}" |grep "\-${opt}")"
+
+
+  [ "${opt}" = "?" ] && help "Invalid use of script: ${@} "
+  varname="arg_${opt:0:1}"
+  default="${!varname}"
+
+  value="${OPTARG}"
+  if [ -z "${OPTARG}" ] && [ "${default}" = "0" ]; then
+    value="1"
+  fi
+
+  eval "${varname}=\"${value}\""
+  debug "cli arg ${varname} = ($default) -> ${!varname}"
+done
+
+shift $((OPTIND-1))
+
+[ "$1" = "--" ] && shift
+
+
+### Switches
+#####################################################################
+
+# debug mode
+if [ "${arg_d}" = "1" ]; then
+  set -x
+  LOG_LEVEL="7"
+fi
+
+# help mode
+if [ "${arg_h}" = "1" ]; then
+  help "Help using ${0}"
+fi
+
+
+### Validation
+#####################################################################
+
+[ -z "${arg_f}" ]     && help   "Setting a filename with -f is required"
+[ -z "${LOG_LEVEL}" ] && emergency "Cannot continue without loglevel. "
+
+
+### Runtime
+#####################################################################
+
+# Exit on error. Append ||true if you expect an error.
+# set -e is safer than #!/bin/bash -e because that is nutralised if
+# someone runs your script like `bash yourscript.sh`
+set -e
+
+# Bash will remember & return the highest exitcode in a chain of pipes.
+# This way you can catch the error in case mysqldump fails in `mysqldump |gzip`
+set -o pipefail
+
+debug "Info useful to developers for debugging the application, not useful during operations."
+info "Normal operational messages - may be harvested for reporting, measuring throughput, etc. - no action required."
+notice "Events that are unusual but not error conditions - might be summarized in an email to developers or admins to spot potential problems - no immediate action required."
+warning "Warning messages, not an error, but indication that an error will occur if action is not taken, e.g. file system 85% full - each item must be resolved within a given time. This is a debug message"
+error "Non-urgent failures, these should be relayed to developers or admins; each item must be resolved within a given time."
+critical "Should be corrected immediately, but indicates failure in a primary system, an example is a loss of a backup ISP connection."
+alert "Should be corrected immediately, therefore notify staff who can fix the problem. An example would be the loss of a primary ISP connection."
+emergency "A \"panic\" condition usually affecting multiple apps/servers/sites. At this level it would usually notify all tech staff on call."