pipe.sh

# test.sh
#!/bin/bash
./test.exe|./readb.exe -t90|./readb.exe -t91

# pipe.sh
#!/bin/bash
for p in /proc/[0-9]*; do
    if [[ "`readlink $p/fd/0`" != *pipe* ]] && [[ "`readlink $p/fd/1`" != *pipe* ]]; then continue; fi;
    echo "pid: $p in:`readlink $p/fd/0` out:`readlink $p/fd/1`"
done
# pid: /proc/53988 in:/dev/pty0 out:pipe:[596] cmd:./test
# pid: /proc/71072 in:pipe:[616] out:pipe:[220] cmd:./readb-t90
# pid: /proc/69956 in:pipe:[224] out:/dev/pty0 cmd:./readb-t91