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#! /usr/bin/env python
# Print From and Subject of messages in $MAIL.
# Extension to multiple mailboxes and other bells & whistles are left
# as exercises for the reader.
import sys, os
# Open mailbox file. Exits with exception when this fails.
try:
mailbox = os.environ['MAIL']
except (AttributeError, KeyError):
sys.stderr.write('No environment variable $MAIL\n')
sys.exit(2)
try:
mail = open(mailbox)
except IOError:
sys.exit('Cannot open mailbox file: ' + mailbox)
while 1:
line = mail.readline()
if not line:
break # EOF
if line.startswith('From '):
# Start of message found
print(line[:-1], end=' ')
while 1:
line = mail.readline()
if not line or line == '\n':
break
if line.startswith('Subject: '):
print(repr(line[9:-1]), end=' ')
print()
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