id: add -z, --zero option

* src/group-list.h (print_group_list): Add a parameter for the
delimiter of type char.
* src/group-list.c (print_group_list): Likewise, and use it instead
of a white space character to delimit the group entries.
* src/groups.c (main): Pass white space character to print_group_list().
* src/id.c (longopts):  Add array element for the new long option.
(usage): Document the new option.  While at it, fix the alignment
of the descriptions to match that of HELP_OPTION_DESCRIPTION.
(main): Define the bool flag opt_zero indicating the use of the
new option.  In the getopt_long loop, handle it.
Output an error diagnostic in the case the --zero option has been
specified together with the default format.
In the case of -gG, pass either a NUL or a white space character to
print_group_list() - depending on the above new flag.
Likewise change the printing of the final newline character: output
a NUL instead if the --zero option has been specified.
* doc/coreutils.texi (id invocation): Document the new option.
While at it, move the @exitstatus macro down after the macro
@primaryAndSupplementaryGroups in order to be consistent with
other texinfo documents.
(groups invocation): Move @exitstatus down after the macro
@primaryAndSupplementaryGroups here, too.
* tests/misc/id-zero.sh: Add new test exercising the new option.
* tests/local.mk (all_tests): Reference it.
* NEWS (New features): Mention the new option.
Fixes http://bugs.gnu.org/9987

1 files changed, 3 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index d26722ddf..23c7b54fd 100644
--- a/NEWS
+++ b/NEWS
@@ -44,6 +44,9 @@ GNU coreutils NEWS                                    -*- outline -*-
   du accepts a new option: --inodes to show the number of inodes instead
   of the blocks used.
 
+  id accepts a new option: --zero (-z) to delimit the output entries by
+  a NUL instead of a white space character.
+
   id and ls with -Z report the SMACK security context where available.
   mkdir, mkfifo and mknod with -Z set the SMACK context where available.