removing the duplicate lines in a file


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# 1  
removing the duplicate lines in a file

Hi,

I need to concatenate three files in to one destination file.In this if some duplicate data occurs it should be deleted.
eg:
file1:
-----
data1 value1
data2 value2
data3 value3

file2:
-----
data1 value1
data4 value4
data5 value5

file3:
-----
data1 value1
data4 value4
data3 value3
data6 value6

the result file:
--------------
data1 value1
data2 value2
data3 value3
data4 value4
data5 value5
data6 value6

How to achieve this?
# 2  
try:
Code:
cat file1 file2 file3 | sort | uniq

# 3  
No need for sort | uniq because sort -u will do it in one step.
# 4  
MySQL Try this

sort -u file*

or

sort -u file1 file2 file3
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