1 #! /usr/bin/env python 2 3 # Print From and Subject of messages in $MAIL. 4 # Extension to multiple mailboxes and other bells & whistles are left 5 # as exercises for the reader. 6 7 import sys, os 8 9 # Open mailbox file. Exits with exception when this fails. 10 11 try: 12 mailbox = os.environ['MAIL'] 13 except (AttributeError, KeyError): 14 sys.stderr.write('No environment variable $MAIL\n') 15 sys.exit(2) 16 17 try: 18 mail = open(mailbox) 19 except IOError: 20 sys.exit('Cannot open mailbox file: ' + mailbox) 21 22 while 1: 23 line = mail.readline() 24 if not line: 25 break # EOF 26 if line.startswith('From '): 27 # Start of message found 28 print line[:-1], 29 while 1: 30 line = mail.readline() 31 if not line or line == '\n': 32 break 33 if line.startswith('Subject: '): 34 print repr(line[9:-1]), 35 print 36
