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vi first appeared in 1BSD.
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id(1) [bsd man page]

ID(1)								   User Commands							     ID(1)

NAME
id - print real and effective user and group IDs SYNOPSIS
id [OPTION]... [USER] DESCRIPTION
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 process -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. AUTHOR
Written by Arnold Robbins and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report id translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/id> or available locally via: info '(coreutils) id invocation' GNU coreutils 8.28 January 2018 ID(1)

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ID(1)								   User Commands							     ID(1)

NAME
id - print real and effective user and group IDs SYNOPSIS
id [OPTION]... [USER] DESCRIPTION
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 process -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. AUTHOR
Written by Arnold Robbins and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report id translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/id> or available locally via: info '(coreutils) id invocation' GNU coreutils 8.28 January 2018 ID(1)

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