Hi Pascal,
> file_info(){
> echo -n ${1:=/dev/stdin}$'\t'
> (
> tee < "${1}" \
> >( file --mime-type -b -e compress -e tar -e elf - >&3 ) \
> >( md5sum >&3 ) \
> >( sha1sum >&3 ) \
> >/dev/null
> ) 3>&1 |
> tr '\n' '\t'
> echo
> }
>
> it no longer works because the data flow is quickly interrupted by tee
> which does not consume all the data.
You're missing the reason why. tee(1) receives a SIGPIPE because it
writes to a pipe that's closed. Adding a cat(1) is a waste of CPU, as
is discarding tee's stdout instead of using it for one of the workers.
Examine these differences.
$ seq 31415 | wc
31415 31415 177384
$ seq 31415 | tee >(sed q) >(wc) > >(tr -d 42 | wc); sleep 1
1
14139 14109 62130
12773 12774 65536
$ seq 31415 | (trap '' pipe; tee >(sed q) >(wc) > >(tr -d 42 | wc)); sleep 1
1
31415 31369 142504
31415 31415 177384
$
Note the output of the commands can be in any order, and intermingle if
they're long enough.
tee(1) has -p and --output-error but they're not as specific as stating
SIGPIPE is expected for just one worker.
--
Cheers, Ralph.
