z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

Exit Values
Portability
Related Information
sh, tcsh, true
Because this command always succeeds, the only possible exit status is:
0 Successful completion
POSIX.2, X/Open Portability Guide, UNIX systems.
comm — Show and select or reject lines common to two files
Format
Description
Options
Localization
Exit Values
comm [–123] file1 file2
comm locates identical lines within files sorted in the same collating sequence, and
produces three columns; the first contains lines found only in the first file, the
second lines only in the second file, and the third lines that are in both files.
–1 Suppresses lines that appear only in file1
–2 Suppresses lines that appear only in file2
–3 Suppresses lines that appear both in file1 and file2
The options suppress individual columns. Thus, to list only the lines common to
both files, use:
comm -12
To find lines unique to one file or the other, use:
comm -3
Observe that comm -123 displays nothing.
comm uses the following localization environment variables:
v LANG
v LC_ALL
v LC_COLLATE
v LC_CTYPE
v LC_MESSAGES
v NLSPATH
See Appendix F for more information.
: (colon)
0 Successful completion
1 Failure because of an error opening or reading an input file
2 Failure that generated a usage message, such as naming only one input
file
Chapter 2. Shell command descriptions 141