On 06/07/2017 09:44 AM, NeilBrown wrote:
On Tue, Jun 06 2017, Zhilong Liu wrote:
This helps with piping to a paper.
It might help you, but it is an API change and could cause problems for
others.
Some programs, such as "mount -V", send version info to stdout.
Others, like "gcc -v", send it to stderr.
There is no uniform standard, it is best to leave the behavior
unchanged.
If you need to capture the output use
mdadm -V |& ...
or
mdadm -V 2>&1
or similar.
Thanks for your detail explanations. Yes, I just encountered this issue
in my progress of improving ./mdadm/test script,
the ./mdadm --version always prints to stderr, thus I post this email,
and I have already used "2>&1" in my test script.
Thanks very much,
-Zhilong
NeilBrtown
Signed-off-by: Zhilong Liu <zlliu@xxxxxxxx>
---
mdadm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mdadm.c b/mdadm.c
index 70b16f2..0f736d7 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -139,7 +139,7 @@ int main(int argc, char *argv[])
continue;
case 'V':
- fputs(Version, stderr);
+ fputs(Version, stdout);
exit(0);
case 'v': c.verbose++;
--
2.6.6
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