/usr/bin/comm

Compare two sorted files line by line.

When FILE1 or FILE2 (not both) is -, read standard input.

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.

Usage: comm [OPTION]... FILE1 FILE2

Arguments:
  <FILE1>
  <FILE2>

Options:
  -1                            suppress column 1 (lines unique to FILE1)
  -2                            suppress column 2 (lines unique to FILE2)
  -3                            suppress column 3 (lines that appear in both files)
      --output-delimiter <STR>  separate columns with STR
  -z, --zero-terminated         line delimiter is NUL, not newline
      --total                   output a summary
      --check-order             check that the input is correctly sorted, even if all input lines
                                are pairable
      --nocheck-order           do not check that the input is correctly sorted
  -h, --help                    Print help
  -V, --version                 Print version