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CentOS 7.0 - man page for id (centos section 1)

ID(1)								   User Commands							     ID(1)

id - print real and effective user and group IDs
id [OPTION]... [USER]
Print user and group information for the specified USER, or (when USER omitted) for the current user. -a ignore, for compatibility with other versions -Z, --context print only the security context of the current user -g, --group print only the effective group ID -G, --groups print all group IDs -n, --name print a name instead of a number, for -ugG -r, --real print the real ID instead of the effective ID, with -ugG -u, --user print only the effective user ID -z, --zero delimit entries with NUL characters, not whitespace; not permitted in default format --help display this help and exit --version output version information and exit Without any OPTION, print some useful set of identified information. GNU coreutils online help: <> Report id translation bugs to <>
Written by Arnold Robbins and David MacKenzie.
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
The full documentation for id is maintained as a Texinfo manual. If the info and id programs are properly installed at your site, the com- mand info coreutils 'id invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 ID(1)