Re: Use of pipe in $(< filename | program) returns null

[Andreas Schwab]

Bernd Eggink <monoped@sudrala.de> writes:

> Am 28.11.2009 06:35, schrieb root@saturn.syslang.net:
>>
>> Description:
>>      use of $(<  filename | program) does not work. It either should or it 
>> should be properly documented.
>>      The problem also happens on bash4.
>>
>> Repeat-By:
>>
>>      qq=$(<  /etc/passwd | grep sys)
>>      echo $qq
>>      # result is null
>>
>> Fix:
>>      Either fix the docs to tell people that a pipe is not allowed or fix 
>> the code to allow it.
>
> The problem is not the pipe but the fact that '<filename' is an empty
> command which does nothing. If you want 'program' to read from 'file', use
> program<file'.

Or even $(< /etc/passwd grep sys).

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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