How to remove duplicate words from a plain text file using linux command

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Posted by cupakob on Stack Overflow See other posts from Stack Overflow or by cupakob
Published on 2009-06-04T18:24:38Z Indexed on 2010/04/02 2:33 UTC
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I have a plain text file with words, which are separated by comma, for example:

word1, word2, word3, word2, word4, word5, word 3, word6, word7, word3

i want to delete the duplicates and to become:

word1, word2, word3, word4, word5, word6, word7

Any Ideas? I think, egrep can help me, but i'm not sure, how to use it exactly....

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