select or reject lines common to two sorted files
comm [ -123 ] file1 file2
comm reads file1 and file2, which
should be ordered
according to the collating sequence defined by the current locale
and produces a three-column output: lines only in file1;
lines only in file2; and lines in both files. The filename
``-'' 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 is a no-op (does nothing).
comm understands the -- option delimiter.
comm returns the following values:
all input files were successfully output as specified
an error occurred
comm is conformant with:
ISO/IEC DIS 99452:1992, Information technology Portable Operating System Interface (POSIX) Part 2: Shell and Utilities (IEEE Std 1003.21992);
AT&T SVID Issue 2;
X/Open CAE Specification, Commands and Utilities, Issue 4, 1992.
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003