SYNTAX :
join -t'DELIMITER' -1 FILE_1_join_column -2 FILE_2_join_column FILE_1 FILE_2 > OUTPUT_FILE
join -t'\t' -1 1 -2 2 a.txt b.txt > a_b.outDELIMITER' -1 FILE_1_join_column -2 FILE_2_join_column FILE_1 FILE_2 > OUTPUT_FILE
join -t'\t' -1 1 -2 2 a.txt b.txt > a_b.out\t' -1 1 -2 2 a.txt b.txt > a_b.outDELIMITER' -1 FILE_1_join_column -2 FILE_2_join_column FILE_1 FILE_2 > OUTPUT_FILE
join -t'\t' -1 1 -2 2 a.txt b.txt > a_b.out\t' -1 1 -2 2 a.txt b.txt > a_b.out\t' -1 1 -2 2 a.txt b.txt > a_b.outDELIMITER' -1 FILE_1_join_column -2 FILE_2_join_column FILE_1 FILE_2 > OUTPUT_FILE
join -t$'\t' -1 1 -2 2 a.txt b.txt > a_b.out\t' -1 1 -2 2 a.txt b.txt > a_b.out\t' -1 1 -2 2 a.txt b.txt > a_b.out\t' -1 1 -2 2 a.txt b.txt > a_b.outDELIMITER' -1 FILE_1_join_column -2 FILE_2_join_column FILE_1 FILE_2 > OUTPUT_FILE
join -t$'\t' -1 1 -2 2 a.txt b.txt > a_b.out
