make

[James Mcphee]

you've said make, append stdout (default file descriptor 1) to file
make.fail, assign stderr (default filedescriptor 2) the same filedescriptor
as stdout.  So...  If the intent was to have both stderr and stdout append
make.fail, then it is correct.


On Sun, Aug 24, 2014 at 6:06 PM, Michael Havens <bmike1 at gmail.com> wrote:

> what I really need to know is will this:
>
>    make>>make.fail 2>&1
>
> send stderr and stdout to the file 'make.fail' or did I write it
> incorrectly?
>
> :-)~MIKE~(-:
>
>
> On Sun, Aug 24, 2014 at 2:56 PM, Brian Cluff <brian at snaptek.com> wrote:
>
>> the > will delete any file that it points at even if the command doesn't
>> actually output anything.  It will even delete the file is the command
>> doesn't exist like if you type grep as gerp >file, file will still be
>> created/overwritten.
>>
>> If you want to make sure that your command doesn't overwrite any existing
>> files you have to set the noclobber option like:
>> $ set -o noclobber
>>
>> A good trick to know:
>> You can use the > to delete the contents of a file without having to
>> delete and recreate the file by simply doing this:
>> $ >yourfile
>>
>> Brian Cluff
>>
>>
>> On 08/24/2014 02:36 PM, Michael Havens wrote:
>>
>>> I have a question about redirections:
>>>
>>>     make>>make.fail 2>&1
>>>
>>> tells it make and then to send (>) stderr (2) to stdout (1) and also to
>>> send stdout that way also (&1). finally all of that gets sent to a file
>>> named make.fail (>>). Isn't '>>' actually 'append' whereas '>' would
>>> work just as well so long as the file didn't already exist? If the file
>>> did exist would I get an error or would the file be overwritten?
>>> :-)~MIKE~(-:
>>>
>>>
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-- 
James McPhee
jmcphe at gmail.com
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