change posix to os; and change error message
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@ -4,15 +4,14 @@
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# Extension to multiple mailboxes and other bells & whistles are left
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# as exercises for the reader.
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import sys, posix
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import sys, os
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# Open mailbox file. Exits with exception when this fails.
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try:
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mailbox = posix.environ['MAIL']
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except RuntimeError:
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sys.stderr.write \
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('Please set environment variable MAIL to your mailbox\n')
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mailbox = os.environ['MAIL']
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except (AttributeError, KeyError):
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sys.stderr.write('No environment variable $MAIL\n')
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sys.exit(2)
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try:
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