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Re: 問題ID:21935
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最強WEB問題集LinuC/LPIC Lv1 102
投稿ﾕｰｻﾞ(投稿日)
(2015/11/8)
本文
もうちょっと細かいのを｡

POSIX 1003.1 - man page for crontab (posix section 1posix) - Unix & Linux Commands
http://www.unix.com/man-page/posix/1posix/crontab

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Users shall be permitted to use crontab if their names appear in the file
/usr/lib/cron/cron.allow. If that file does not exist, the file /usr/lib/cron/cron.deny
shall be checked to determine whether the user shall be denied access to crontab. If nei-
ther file exists, only a process with appropriate privileges shall be allowed to submit a
job. If only cron.deny exists and is empty, global usage shall be permitted. The
cron.allow and cron.deny files shall consist of one user name per line.

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COPYRIGHTにも

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Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group.

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とあり､例示されたﾄﾞｷｭﾒﾝﾄにある

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crontab ｺﾏﾝﾄﾞは､IEEE Std1003.2-1992 (``POSIX'') に準拠している｡

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よりも新しいので､新しい標準であるPOSIX.1-2001, SUSv3のXSI 準拠によって挙動が変わってるみたいですね｡

参考情報としてですが､1003.1-1990と1003.2-1992は1003.1に統合されたらしいです｡
http://www.opengroup.org/austin/papers/posix_faq.html

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