$ man comm NAME comm - compare two sorted files line by line SYNOPSIS comm [OPTION]... FILE1 FILE2 DESCRIPTION Compare sorted files FILE1 and FILE2 line by line. With no options, produce three-column output. Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and column three contains lines common to both files. -1 suppress lines unique to FILE1 -2 suppress lines unique to FILE2 -3 suppress lines that appear in both files --help display this help and exit --version output version information and exit