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Remove duplicate chars and sort string [SED]

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# 1  
Old 06-21-2012
Remove duplicate chars and sort string [SED]
Hi,

INPUT:
DCBADD

OUTPUT:
ABCD

The SED script should alphabetically sort the chars in the string and remove the duplicate chars.
# 2  
Old 06-21-2012
Does it have to be sed?
# 3  
Old 06-21-2012
Yes. No 'uniq' or 'sort' this time Smilie
# 4  
Old 06-21-2012
And why no "uniq" or "sort"? Is it some homework?
# 5  
Old 06-21-2012
No. It is a question asked on previous exams and
I was wondering how to answer it.
# 6  
Old 06-21-2012
Do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum under special homework rules.

Please review the rules, which you agreed to when you registered, if you have not already done so.

More-than-likely, posting homework in the main forums has resulting in a forum infraction. If you did not post homework, please explain the company you work for and the nature of the problem you are working on.

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Thank You.

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