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BSD 2.11 - man page for comm (bsd section 1)

COMM(1) 				       General Commands Manual					      COMM(1)

NAME
comm - select or reject lines common to two sorted files
SYNOPSIS
comm [ - [ 123 ] ] file1 file2
DESCRIPTION
Comm reads file1 and file2, which should be ordered in ASCII collating sequence, and produces a three column output: lines only in file1; lines only in file2; and lines in both files. The filename `-' means the stan- dard input. Flags 1, 2, or 3 suppress printing of the corresponding column. Thus comm -12 prints only the lines common to the two files; comm -23 prints only lines in the first file but not in the second; comm -123 is a no-op.
SEE ALSO
cmp(1), diff(1), uniq(1) 7th Edition April 29, 1985 COMM(1)


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