03-01-2013
The usual approach is to put them either BEFORE the BEGIN rule, or AFTER the END rule. Performance-wise, it doesn't matter. You might want to have a look at
User-defined - The GNU Awk User's Guide
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GROUPS(1) User Commands GROUPS(1)
NAME
groups - print the groups a user is in
SYNOPSIS
groups [OPTION]... [USERNAME]...
DESCRIPTION
Print group memberships for each USERNAME or, if no USERNAME is specified, for the current process (which may differ if the groups database
has changed).
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by David MacKenzie and James Youngman.
REPORTING BUGS
Report groups bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report groups translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2010 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
The full documentation for groups is maintained as a Texinfo manual. If the info and groups programs are properly installed at your site,
the command
info coreutils 'groups invocation'
should give you access to the complete manual.
GNU coreutils 8.5 February 2011 GROUPS(1)