bash - Redirect stdin to stdout while waiting for background process -

i have following code:

cmd cmd_args & wait_pid=$!  trap "kill -s sigterm $wait_pid" sigterm sigint sigkill  wait $wait_pid

with want able kill background process whenever tries kill script. however, still want stdin redirected background process, not happening.

i grab wait's stdin , redirect background process. that, i've tried:

wait $wait_pid 0>&1 1> named_pipe

but without luck.

as mentioned, can't trap sigkill (or sigstop).

other that, try this:

#!/bin/bash cmd cmd_args <&0 & wait_pid=$! trap "kill -s sigterm $wait_pid" sigterm sigint wait $wait_pid

the <&0 tell bash want cmd's stdin script's stdin.

slightly off topic, interesting method of dumping bytes running process' stdin send them directly it's /proc file descriptor, in:

echo "stuff send process" >/proc/$wait_pid/fd/0

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