remove unnecessary lines

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# 1  
Old 11-22-2001
remove unnecessary lines

If I have a file with 5000 lines contains numbers. Some of the number are repeated and some are not. Among those repeated number, I only would like to keep only one. How do I remove those balance repeated number.

Your help is much appreciated. Thank you.
# 2  
Old 11-22-2001

Try using this command: UNIQ

The uniq utility will read an input file comparing adjacent
lines, and write one copy of each input line on the output.
The second and succeeding copies of repeated adjacent input
lines will not be written.
# 3  
Old 11-22-2001
use sort and uniq:
cat file | sort | uniq > out.file
# 4  
Old 11-23-2001
Originally posted by tonyt
use sort and uniq:
cat file | sort | uniq > out.file
or cat file| sort -u > out.file

But "sort" needs "-n" for number sorting
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