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Oct-21-11 12:23:27
fant
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Command cp in ip04 vs cp in ubuntu

Hi guys,

I copy file to symlink, and I have different result in ip04 and Ubuntu.
File replace symlink in ip04. Why?
That behaviour of command "cp" is correct?

Andrej

in IP04

Code:

root@ip0x:~> cat > 1

111111



root@ip0x:~> ln -sf 1 2

root@ip0x:~> cat > 3

33333



root@ip0x:~> cp 3 2

root@ip0x:~> cat 1

111111

root@ip0x:~> ls -l

-rw-r--r--    1 root     root             7 Oct 21 11:48 1

-rw-r--r--    1 root     root             6 Oct 21 11:48 2

-rw-r--r--    1 root     root             6 Oct 21 11:48 3

In Ubuntu

Code:

$ cat > 1

111111

^C

$ ln -sf 1 2

$ cat > 3

33333

^C

$ cp 3 2

$ ls -l

-rw-r--r--  1 an an    6 2011-10-21 11:39 1

lrwxrwxrwx  1 an an    1 2011-10-21 11:39 2 -> 1

-rw-r--r--  1 an an    6 2011-10-21 11:39 3

$ cat 1

33333


Edited By:  fant
Oct-21-11 12:26:17

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Oct-21-11 13:11:33
Chewi
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Re: Command cp in ip04 vs cp in ubuntu

We use Busybox cp, not GNU cp, and apparently the behaviour is intended as the author disagrees with the POSIX behaviour.

http://lists.busybox.net/pipermail/busy … 69533.html

I'm on the fence with this one. I can see his point and Busybox doesn't pretend to be POSIX compliant but breaking compatibility for idealogical reasons seems controversial.

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Oct-21-11 14:14:00
fant
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Re: Command cp in ip04 vs cp in ubuntu

Hi Chewi,

Thanks to answer. BusyBox v1.4.1 not replaced link. hmm


Code:

BusyBox v1.4.1 (2009-05-19 16:40:05 EEST) Built-in shell (msh)

Enter 'help' for a list of built-in commands.



root:/> cat > 1

11111

root:/> ln -sf 1 2

root:/> cat > 3

3333

root:/> cp 3 2

root:/> ls -l

-rw-r--r--    1 root     root            5 Oct 21 08:43 1

lrwxrwxrwx    1 root     root            1 Oct 21 08:43 2 -> 1

-rw-r--r--    1 root     root            5 Oct 21 08:43 3

root:/> cat 1

3333

root:/> uname -a

Linux blackfin 2.6.22.18-ADI-2008R1-svn #253 Thu Oct 15 14:13:30 EEST 2009 blackfin unknown

How work command "cat" with binary file? Zero will not be taken as an end of file? Or other shadow problem?

   cat binary.file > /dev/xxx

Andrej

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Oct-21-11 15:30:49
Chewi
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Re: Command cp in ip04 vs cp in ubuntu

1.4.1 is very old. Trunk is using 1.16.2 and my Gentoo system is using 1.19.2, which is also displaying this behaviour.

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