Piping output of sox to a file produces empty text

Piping output of sox to a file produces empty text

[Ariel Elkin]

Hello,

I’d like to save the output of the stat command to a file. 

When I call
sox file.mp3 -n stat 

The output is correctly displayed. But If I then do 
sox file.mp3 -n stat > file.txt

file.txt is empty. 

Why? 

Thanks

Ariel

_______________________________________________
Sox-users mailing list
Sox-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sox-users

Re: Piping output of sox to a file produces empty text

[Jeff Learman]

[-- Attachment #1.1: Type: text/plain, Size: 740 bytes --]

I didn't check, but perhaps sox text output is going to stderr.  For
Linux/UNIX, using many shells (sh, ksh, tsh, zsh, bash, but not csh),
redirect stderr this way:

sox file.mp3 -n stat > file.txt 2>&1

Jeff

On Mon, 27 Jul 2020 at 14:49, Ariel Elkin <ariel@arivibes.com> wrote:

> Hello,
>
> I’d like to save the output of the stat command to a file.
>
> When I call
> sox file.mp3 -n stat
>
> The output is correctly displayed. But If I then do
> sox file.mp3 -n stat > file.txt
>
> file.txt is empty.
>
> Why?
>
> Thanks
>
> Ariel
>
> _______________________________________________
> Sox-users mailing list
> Sox-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/sox-users
>

[-- Attachment #1.2: Type: text/html, Size: 1314 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]



[-- Attachment #3: Type: text/plain, Size: 158 bytes --]

_______________________________________________
Sox-users mailing list
Sox-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sox-users

Re: Piping output of sox to a file produces empty text

[Jeff Learman]

[-- Attachment #1.1: Type: text/plain, Size: 1069 bytes --]

Should have added:

If it's working correctly, you won't see the output.
What that stuff on the end means is, send stdout to file.txt, and make fd 2
(which is stderr) a copy of fd 1 (which is stdout).



On Mon, 27 Jul 2020 at 15:02, Jeff Learman <jjlearman@gmail.com> wrote:

> I didn't check, but perhaps sox text output is going to stderr.  For
> Linux/UNIX, using many shells (sh, ksh, tsh, zsh, bash, but not csh),
> redirect stderr this way:
>
> sox file.mp3 -n stat > file.txt 2>&1
>
> Jeff
>
> On Mon, 27 Jul 2020 at 14:49, Ariel Elkin <ariel@arivibes.com> wrote:
>
>> Hello,
>>
>> I’d like to save the output of the stat command to a file.
>>
>> When I call
>> sox file.mp3 -n stat
>>
>> The output is correctly displayed. But If I then do
>> sox file.mp3 -n stat > file.txt
>>
>> file.txt is empty.
>>
>> Why?
>>
>> Thanks
>>
>> Ariel
>>
>> _______________________________________________
>> Sox-users mailing list
>> Sox-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/sox-users
>>
>

[-- Attachment #1.2: Type: text/html, Size: 1967 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]



[-- Attachment #3: Type: text/plain, Size: 158 bytes --]

_______________________________________________
Sox-users mailing list
Sox-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sox-users

Re: Piping output of sox to a file produces empty text

[Måns Rullgård]

Jeff Learman <jjlearman@gmail.com> writes:

>> On Mon, 27 Jul 2020 at 14:49, Ariel Elkin <ariel@arivibes.com> wrote:
>>
>>> Hello,
>>>
>>> I’d like to save the output of the stat command to a file.
>>>
>>> When I call
>>> sox file.mp3 -n stat
>>>
>>> The output is correctly displayed. But If I then do
>>> sox file.mp3 -n stat > file.txt
>>>
>>> file.txt is empty.
>>>
>>> Why?
>
> I didn't check, but perhaps sox text output is going to stderr.  For
> Linux/UNIX, using many shells (sh, ksh, tsh, zsh, bash, but not csh),
> redirect stderr this way:
>
> sox file.mp3 -n stat > file.txt 2>&1

Per the man page, "The information is output to the `standard error'
(stderr) stream."

-- 
Måns Rullgård


_______________________________________________
Sox-users mailing list
Sox-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sox-users