Sort
Sorts lines alfabetically With -u or | uniq, removes repeated lines
cp file1 copia && sort -u copia > file1 && rm copia
sort file1 file2 | uniq > file3
Sorts lines alfabetically With -u or | uniq, removes repeated lines
cp file1 copia && sort -u copia > file1 && rm copia
sort file1 file2 | uniq > file3