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$ id root nobody uid=0(root) gid=0(root) groups=0(root) uid=99(nobody) gid=99(nobody) groups=99(nobody) * src/id.c (main): Make variables opt_zero, just_group_list, just_group, use_real, just_user global to be used in a new function. (print_stuff): New function that will print user and group information for the specified USER. When using -G option delimit each record with two NULs. Restructure the code in the file to have global variables followed by functions. * tests/id/zero.sh: Add test cases to check the usage of -z option with multiple users. * tests/id/uid.sh: Add a test case to ensure all users are queried in the presence of errors. * doc/coreutils.texi: Document the interface changes. * NEWS: Mention the new feature.