Re: access the stdin of the parent process in a pipeline

[Chet Ramey]

On 3/25/20 8:45 AM, Peng Yu wrote:
>> function g1 {
>>   seq 3 | awk -e 'BEGIN { while(getline < "/dev/stdin") print } {
>> print }' /dev/fd/4
>> } 4<&0
>>
>> $ seq 4 | g1
>> 1
>> 2
>> 3
>> 1
>> 2
>> 3
>> 4
> 
> I never knew that I could add redirection after the function
> declaration. This is neat.

Yes. A function declaration is a compound command, and compound commands
may be followed by redirections.

POSIX specifies that the shell processes any redirections following a
function declaration when the function is executed.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/