comm(1)                                                      comm(1)


       NAME
             comm - select or reject lines common to two sorted files

       SYNOPSIS
             comm [-123] file file2

       DESCRIPTION
             comm reads file1 and file2, which should be ordered in the
             current locale's 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 nothing.

             The lines are compared using the current locale's collation
             sequence, set by the environment variable LC_COLLATE. [see
             LANG in environ(5) for the locale environment variables, and
             their effects on collation.] Note that if the files were
             sorted with a different collation sequence from each other, or
             from that under which comm is executed, the results will be
             meaningless.

             The LC_CTYPE environment variable determines the codesets used
             in the command line arguments and the files. [see LANG on
             environ(5)].  Note that if this variable differs when the
             files are sorted, or when comm is executed, the output of comm
             will be meaningless.  Note also, that if LC_CTYPE and
             LC_COLLATE are set to different values, meaningful results
             cannot be guaranteed.

          Files
             /usr/lib/locale/locale/LC_MESSAGES/uxdfm
                   language-specific message file [see LANG on environ(5)].

       REFERENCES
             cmp(1), diff(1), join(1), sort(1), uniq(1)








                           Copyright 1994 Novell, Inc.               Page 1