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Removing duplicates from string (not duplicate lines)


 
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# 8  
I did try this way

bash-3.00# echo "hello hello hi" | tr ' \t' '\012' | sort -u | tr '\012' '\t'
hello hi bash-3.00#

Now i am getting extra spaces in the end and solution doesn't look too neat either.

please tell a better way to remove duplicates from string
This User Gave Thanks to vickylife For This Post:
# 9  
another way:
Code:
printf "%s\n" apple apple orange pear | nawk '!($0 in w){s=(s?s OFS:"")$0;w[$0]}END{print s}' OFS='\t'


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