cpython/Demo/scripts/from.py

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#! /usr/local/bin/python
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# 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
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# Open mailbox file. Exits with exception when this fails.
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try:
mailbox = os.environ['MAIL']
except (AttributeError, KeyError):
sys.stderr.write('No environment variable $MAIL\n')
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sys.exit(2)
try:
mail = open(mailbox, 'r')
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except IOError:
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sys.stderr.write('Cannot open mailbox file: ' + mailbox + '\n')
sys.exit(2)
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while 1:
line = mail.readline()
if not line: break # EOF
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if line[:5] == 'From ':
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# Start of message found
print line[:-1],
while 1:
line = mail.readline()
if not line: break # EOF
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if line == '\n': break # Blank line ends headers
if line[:8] == 'Subject:':
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print `line[9:-1]`,
print