I'm looking to find common lines between two files
$ 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 FIL
+E2, 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
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