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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/coreutils.texi | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi index d0694fdd0..521ac3923 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -5174,6 +5174,37 @@ rather than the default of a single TAB character. The delimiter @var{str} may not be empty. +@item --total +Output a summary at the end. + +Similar to the regular output, +column one contains the total number of lines unique to @var{file1}, +column two contains the total number of lines unique to @var{file2}, and +column three contains the total number of lines common to both files, +followed by the word @samp{total} in the additional column four. + +In the following example, @command{comm} omits the regular output +(@option{-123}), thus just printing the summary: + +@example +$ printf '%s\n' a b c d e > file1 +$ printf '%s\n' b c d e f g > file2 +$ comm --total -123 file1 file2 +1 2 4 total +@end example + +This option is a GNU extension. Portable scripts should use @command{wc} to +get the totals, e.g. for the above example files: + +@example +$ comm -23 file1 file2 | wc -l # number of lines only in file1 +1 +$ comm -13 file1 file2 | wc -l # number of lines only in file2 +2 +$ comm -12 file1 file2 | wc -l # number of lines common to both files +4 +@end example + @optZeroTerminated @end table |