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let the first file be a.txt ,second be b.txt and the third one (final file) be c.txt
The command would be
cat a.txt b.txt | sort -u >c.txt
cat a.txt b.txt will combine the two files (with duplicates)
| (pipe) will take the output of the previous command and send it as input the next command sort -u
sort -u will sort it in ascending order taking only the unique values
sort -u > c.txt will send the sorted unique values to c.txt file
cat a.txt,b.txt give 1 2 3 4 5 6 5 6 7 89 10
sort -u will give 1 2 3 4 5 6 7 8 9 10
this output is then stored in c.txt
hope this was what you were looking for
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