bash-2.03$ comm --help
Usage: comm [OPTION]... LEFT_FILE RIGHT_FILE
Compare sorted files LEFT_FILE and RIGHT_FILE line by line.
-1 suppress lines unique to left file
-2 suppress lines unique to right file
-3 suppress lines unique to both files
--help display this help and exit
--version output version information and exit
Report bugs to <[EMAIL PROTECTED]>.
In the help section it should probably read, -3 suppress lines
duplicated in both files. Right now it reads as if -3 replaces -12. J
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