combine files and delete duplicates using Linux

Tags:
Linux
Linux administration
Linux file system
I need to combine 3 text files and delete the duplicate records after combining them.  What is the best way to do this using Linux?

Software/Hardware used:
Linux

Answer Wiki

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cat file_1 file_2 file_3 >> combined_file

sort combined_file | uniq > deduplicated_combined_file

for more information:

man cat
man sort
man uniq

Good luck

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