def ps():
    import os, re

    for i in os.listdir('/proc'):
        if i.isdigit():
            try:
                with open('/proc/%s/cmdline' % i) as f:
                    cmd = re.sub('[\0\s]+', ' ', f.read())
                    print('%5s %s' % (i, cmd))
            except OSError:
                pass

def cat(*files):
    for file in files:
        with open(file) as f:
            for line in f:
                print(line, end='')

def curl(*urls):
    from urllib.request import urlopen, Request

    for url in urls:
        request = Request(url)
        request.add_header('User-Agent', 'curl/7.46.0')
        with urlopen(request) as req:
            print(req.read().decode())