From: Mikhail Zabaluev <mhz@altlinux.org>
To: ALT Devel discussion list <devel@altlinux.ru>
Subject: [devel] Re: как правильно выполнить команду?
Date: Fri, 20 Jun 2003 00:44:52 +0400
Message-ID: <20030619204452.GA11284@mhz.mikhail.zabaluev.name> (raw)
In-Reply-To: <87y8zyqoxt.fsf@pc349.belcaf.minsk.by>
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Hello Grigory,
On Thu, Jun 19, 2003 at 02:36:30PM +0300, Grigory Milev wrote:
>
> >> CMD=/bin/date
> >> [ -x "$CMD" ] && "$CMD"
>
> > CMD=/bin/date
> > [ ! -x "$CMD" ] || "$CMD"
> А в чем половая разница в этих двух вариантах?
Первый в случае отсутствия /bin/date выдаёт ненулевой статус
и вызывает аварийное завершение скрипта при некоторых опциях
bash.
Совсем безопасно и понятно можно написать так:
CMD=/bin/date
if test -x "$CMD"; then
"$CMD"
fi
--
Stay tuned,
MhZ JID: mhz@altlinux.org
___________
To do two things at once is to do neither.
-- Publilius Syrus
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prev parent reply other threads:[~2003-06-19 20:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-19 14:58 ` Alexander Bokovoy
2003-06-19 20:44 ` Mikhail Zabaluev [this message]
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