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比较文件
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User Commands comm(1)
NAME
comm - select or reject lines common to two files
SYNOPSIS
comm [ -123 ] file1 file2
DESCRIPTION
The comm utility will read file1 and file2, which should be
ordered in the current collating sequence, and produce 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 Suppress the output column of lines unique to
file1.
-2 Suppress the output column of lines unique to
file2.
-3 Suppress 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 contained a sorted list of
utilities:
example% comm -23 file1 file2 | comm -23 - file3
would print a list of utilities in file1 not specified by
either of the other files;
User Commands comm(1)
example% comm -12 file1 file2 | comm -12 - file3
would print a list of utilities specified by all three
files; and
example% comm -12 file2 file3 | comm -23 -file1
would print 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 : LC_COLLATE,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 All input files were successfully output as speci-
fied.
>0 An error occurred. |
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