gistfile1.txt

( (for i in $(seq 10);do echo $i.err >&2; echo $i.out ;done | tee out.log ) 2> error.log > all.log 2>&1                                                     :cwd ~/tmp)
(cat out.log                                                                                                                                                :cwd ~/tmp)
1.out
2.out
3.out
4.out
5.out
6.out
7.out
8.out
9.out
10.out
(cat error.log                                                                                                                                              :cwd ~/tmp)
1.err
2.err
3.err
4.err
5.err
6.err
7.err
8.err
9.err
10.err
(cat all.log                                                                                                                                                :cwd ~/tmp)
1.out
1.err
2.err
3.err
4.err
5.err
2.out
3.out
4.out
5.out
6.err
6.out
7.err
7.out
8.err
8.out
9.err
9.out
10.err
10.out