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comm(1)                          User Commands                         comm(1)



NAME
       comm - select or reject lines common to two files

SYNOPSIS
       comm [-123] file1 file2

DESCRIPTION
       The  comm  utility  reads file1 and file2, which must be ordered in the
       current collating sequence, and produces three text columns as  output:
       lines only in file1; lines only in file2; and lines in both files.

       If  the input files were ordered according to the collating sequence of
       the current locale, the lines written will be in the collating sequence
       of the original lines. If not, the results are unspecified.

OPTIONS
       The following options are supported:

       -1       Suppresses the output column of lines unique to file1.



       -2       Suppresses the output column of lines unique to file2.



       -3       Suppresses  the output column of lines duplicated in file1 and
                file2.



OPERANDS
       The following operands are supported:

       file1    A path name of the first file to be compared. If file1  is  -,
                the standard input is used.



       file2    A  path name of the second file to be compared. If file2 is -,
                the standard input is used.



USAGE
       See largefile(5) for the description  of  the  behavior  of  comm  when
       encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXAMPLES
       Example 1: Printing a list of utilities specified by files

       If file1, file2, and file3 each contain a sorted list of utilities, the
       command

       example% comm -23 file1 file2  | comm -23 - file3

       prints a list of utilities in file1 not  specified  by  either  of  the
       other files. The entry:

       example% comm -12 file1 file2 | comm -12 - file3

       prints a list of utilities specified by all three files. And the entry:

       example% comm -12  file2 file3 | comm -23 -file1

       prints  a  list of utilities specified by both file2 and file3, but not
       specified in file1.

ENVIRONMENT VARIABLES
       See environ(5) for descriptions of the following environment  variables
       that  affect the execution of comm: LANG, LC_ALL, LC_COLLATE, LC_CTYPE,
       LC_MESSAGES, and NLSPATH.

EXIT STATUS
       The following exit values are returned:

       0        All input files were successfully output as specified.



       >>0       An error occurred.



ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:


       tab()    allbox;    cw(2.750000i)|     cw(2.750000i)     lw(2.750000i)|
       lw(2.750000i).    ATTRIBUTE   TYPEATTRIBUTE  VALUE  AvailabilitySUNWesu
       CSIenabled Interface StabilityStandard


SEE ALSO
       cmp(1), diff(1), sort(1), uniq(1),  attributes(5),  environ(5),  large-
       file(5), standards(5)



SunOS 5.10                        3 Mar 2004                           comm(1)