archive_command vs. cp -i

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Hi,

while setting up a new linux postgresql server, I checked my archive_command.
I noticed that the usual "cp -i f1 f2 < /dev/null" did NOT as expected: 
It did not overwrite the file (PASS), but it returned zero (FAIL, should return error).

This could be reproduced on CentOS 5.6, RHEL4, and Ubuntu 10.04.

This is my test:
echo huhu  > file1
echo hello > file2
/bin/cp -i  file2 file1 < /dev/null
echo $?   # should return != 0
diff -s file1 file2

Am I missing something here?
Should the BACKUP-ARCHIVING-WAL doc be changed?

Regards,
 Martin

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