Question

How can one redirect stdout pipes and stderr pipes nn ksh on UNIX? (Not Linux).

The following works to redirect to files:

x=0
while [[ "$x" -lt 100 ]]; do
    echo "junk" >&2
    echo "$x log test"
    echo "junk err" &>2
    echo "$x err test" >&2
    x=$(($x+1))
done 2>out1.err 1>out1.log

I’ve tried things to redirect pipes to other processes, like the following but this doesn’t work:

x=0
while [[ "$x" -lt 100 ]]; do
    echo "junk" >&2
    echo "$x log test"
    echo "junk err" &>2
    echo "$x err test" >&2
    x=$(($x+1))
done 2>&3 | sort -u > out2.log 3>&1 | sort -u > out2.err

Answer 1

Process substitution:

some_process 1> >(do_something_with stdout) 2> >(do_something_else_with stderr)