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Shell Programming and Scripting

Deleting Duplicate Records

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# 1  
Old 02-01-2010
Deleting Duplicate Records
Hello,
I'm have a file of xy data with over 1000 records. I want to delete both x and y values for any record that has the same x value as any previous record thus removing the duplicates from my file.
Can anyone help?
Thanks,
Dan
# 2  
Old 02-01-2010
Give the sample data....
# 3  
Old 02-01-2010
This is a short section of the data. The 5th and 6th lines are duplicates and I want to remove the second of these lines.

Code:
130.82 6.89423
131.02 6.88292
131.22 6.87197
131.42 6.86117
131.62 6.85
131.62 6.85004
131.82 6.8383
132.02 6.82671
132.22 6.81563
132.42 6.80492
132.512 6.8
132.62 6.79426
132.82 6.78358
133.02 6.77351
133.22 6.76449
133.42 6.75663
133.616 6.75

# 4  
Old 02-01-2010
Please search the forums using our internal Google search engine or our advanced internal search engine next time. Thank you.

This should work:
Code:
awk '!a[$1]++' file

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