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Re: [coreutils] -avrd option ?
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From: |
Eric Blake |
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Subject: |
Re: [coreutils] -avrd option ? |
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Date: |
Mon, 20 Sep 2010 08:38:50 -0600 |
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Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100907 Fedora/3.1.3-1.fc13 Mnenhy/0.8.3 Thunderbird/3.1.3 |
On 09/20/2010 05:22 AM, Yann wrote:
Dear all,
I searched into "man cp" and the online manual, but did not find any clue...
What is the meaning of -avrd option after cp command ? (Is it the same
as -a option ?)
POSIX requires support for option-letter compression, and GNU tools obey
this by virtue of getopt_long(). That is:
cp -avrd
is strictly equivalent to:
cp -a -v -r -d
The basic rule of thumb is that you can omit ' -' after any short option
that does not take an argument and which is followed by another short
option. And for short options that take mandatory arguments, such as cp
-t, you can omit the space between the option and its argument, so these
are the same:
cp -a -t . foo
cp -at. foo
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org