Given a text file input, what program will change it to the following
output?
The input has the '/' character and has no space (blank) character in
each line.

Rules are:
1. add "%dir /usr/hw/" to lines not ending in 'L', 'H', 'I', 'L' or
'S'.
2. add "%attr(0444,root,root) /usr/hw/" to lines ending in 'L', 'H',
'I' or 'L'.
3. add "%attr(0544,root,root) /usr/hw/" to lines ending in 'S'.
4. add "mkdir -p " to the "longest" unique path of the output of rule
1.

Please help.
Thanks.

Input 1:
Cabc/Cde
Cabc/Cde/Ckl
Cabc/Cde/Ckl/H
Cabc/Cde/Ckl/I
Cabc/Cde/Ckl/L
Cabc/Cde/Ckl/S

Output 1:
%dir /usr/hw/Cabc/Cde
%dir /usr/hw/Cabc/Cde/Ckl
%attr(0444,root,root) /usr/hw/Cabc/Cde/Ckl/H
%attr(0444,root,root) /usr/hw/Cabc/Cde/Ckl/I
%attr(0444,root,root) /usr/hw/Cabc/Cde/Ckl/L
%attr(0544,root,root) /usr/hw/Cabc/Cde/Ckl/S
mkdir -p /usr/hw/Cabc/Cde/Ckl

Input 2:
Cabc/Cde
Cabc/Cde/Ckl
Cabc/Cde/Ckl/Olabel
Cabc/Cde/Ckl/Olabel/L
Cabc/Cde/Ckl/H
Cabc/Cde/Ckl/S
Cabc/Cde/Coo
Cabc/Cde/Coo/H
Cabc/Cde/Coo/I
Cabc/Cde/Coo/L
Cabc/Cde/Coo/S

Output 2:
%dir /usr/hw/Cabc/Cde
%dir /usr/hw/Cabc/Cde/Ckl
%dir /usr/hw/Cabc/Cde/Ckl/Olabel
%dir /usr/hw/Cabc/Cde/Coo
%attr(0444,root,root) /usr/hw/Cabc/Cde/Ckl/Olabel/L
%attr(0444,root,root) /usr/hw/Cabc/Cde/Ckl/H
%attr(0544,root,root) /usr/hw/Cabc/Cde/Ckl/S
%attr(0444,root,root) /usr/hw/Cabc/Cde/Coo/H
%attr(0444,root,root) /usr/hw/Cabc/Cde/Coo/I
%attr(0444,root,root) /usr/hw/Cabc/Cde/Coo/L
%attr(0544,root,root) /usr/hw/Cabc/Cde/Coo/S
mkdir -p /usr/hw/Cabc/Cde/Ckl/Olabel
mkdir -p /usr/hw/Cabc/Cde/Coo

This wreaks of homework.

For homework questions, you will need to provide what you have tried and what in particular is tripping you up. Don't expect us to do your homeword for you. That would be cheating. The only help at this stage is an RTFM answer. See the sed or awk manpages. You may have not even have read the material you should have to not have a clue how to procede.

http://catb.org/~esr/faqs/smart-questions.html

PS Mr C, Freudian slip ?

wreak: http://dictionary.reference.com/search?q=wreak&x=0&y=0
reek: http://dictionary.reference.com/search?q=reek&x=0&y=0

Silly me - my fingers wreak havoc on, and no longer pay any attention to, my brain, and this reeks of senility.

Yeah, I know the feeling. My spelling is usually v good, but my typing otoh ....