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