comm - select or reject lines common to two sorted files
comm [ - [ 123 ] ] file1 file2
comm reads file1 and file2, which should be ordered in ASCII collating
sequence [see sort(1)], and produces a three-column output: lines only in
file1; lines only in file2; and lines in both files. The file name -
means the standard 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 prints
Input lines over 4096 characters long are split every 4096 characters.
language-specific message file [See LANG on environ(5).]
X/Open CAE Specification(1994)--Commands and Utilities.
cmp(1), diff(1), sort(1), uniq(1)
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