Andrew C. H. McMillan Summertime

Custom instructions

I'm Australian

give me some bash boilerplate that:

checks bashes version and refuses to run if its older than current
sets up all safe and desirable shopts: globbing and lastpipe, not nullglob or whatever
Sets up boot, machine, and invocation id from systemd's id stuff
sets up variables for all the XDG dirs
sets up an array called "TRAP_EXIT" that will run on the exit trap

	#!/usr/bin/env python
	import os
	import ctypes
	from ctypes import CDLL
	import sys
	import random
	import string
	from errno import EEXIST
	# C stuff
	libc = CDLL('libc.so.6', use_errno=True)

	class TimeoutMixin:
	def send(self, args, *kwargs):
	if hasattr(self, 'timeout') and 'timeout' not in kwargs:
	kwargs['timeout'] = self.timeout
	return super().send(args, *kwargs)

	# Use
	import requests

	class Session(TimeoutMixin, requests.Session):

	#!/usr/bin/env python
	import argparse
	parser = argparse.ArgumentParser()
	parser.add_argument('-n', '--count', metavar='TIMES', default=None, type=int)
	parser.add_argument('-e', '--every', metavar='SECONDS', default=5, type=float)
	parser.add_argument('-o', '--stdout', action='store_true')
	parser.add_argument('-H', '--header', dest='headers', metavar=('KEY', 'VALUE'), action='append', default=[], nargs=2)
	parser.add_argument('-t', '--template', default='%Y-%m-%dT%H:%M:%S.%f%:z')
	parser.add_argument('--timeout', metavar='SECONDS', default=60, type=float)
	parser.add_argument('url')