Date: Mon, 18 Aug 2003 00:24:35 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Dan Langille <dan@langille.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Is tar doing the right thing here? Message-ID: <20030818052435.GE2653@dan.emsphone.com> In-Reply-To: <3F402191.27576.761E5CF@localhost> References: <3F402191.27576.761E5CF@localhost>
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In the last episode (Aug 18), Dan Langille said:
> Why is this message not being suppressed?
>
> $ tar -czf test.tgz / 2>&1 > /dev/null
> tar: Removing leading `/' from member names
What you did was dup fd1 onto fd2, then redirect fd1 to /dev/null:
fd1 -> stdout fd2 -> stderr
2>&1
fd1 -> stdout fd2 -> stdout
>/dev/null
fd1 -> /dev/null fd2 -> stdout
Swap the two redirects, so you redirect fd1 to /dev/null, then dup it
onto fd2:
fd1 -> stdout fd2 -> stderr
>/dev/null
fd1 -> /dev/null fd2 -> stdout
2>&1
fd1 -> /dev/null fd2 -> /dev/null
--
Dan Nelson
dnelson@allantgroup.com
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