pkcat.py

#!/usr/bin/env python
import zipfile
import fnmatch
from optparse import OptionParser

parser = OptionParser("usage: %prog archive [file]")
(options, args) = parser.parse_args()

try:
    zf = zipfile.ZipFile(args[0])
    try:
        for file in fnmatch.filter(zf.namelist(), args[1]):
            print zf.read(file)
    except IndexError:
        zf.printdir()
    zf.close()
except Exception, e:
    parser.error(e)