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Editing: from.py
#! /usr/bin/python2.7 # 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], while 1: line = mail.readline() if not line or line == '\n': break if line.startswith('Subject: '): print repr(line[9:-1]), print
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