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Top Forums Shell Programming and Scripting finding duplicates in columns and removing lines Post 302189009 by jim mcnamara on Thursday 24th of April 2008 04:42:03 PM
Old 04-24-2008
awk has associative arrays - the key for the mail array is field #3 ($3).
The first time $3 shows up the value of mail[$3] is zero, mail[$3]++ increments that array element to one. The next time $3 is found to have a value of 1. It does not print.

!mail[$3] only evaluates true when mail[$3] == 0, so when it is 1, 2 ,3 ... it evaluates as false.
 

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CLAWS-MAIL-EXTRA-PLUGINS(1)				      General Commands Manual				       CLAWS-MAIL-EXTRA-PLUGINS(1)

NAME
claws-mail-extra-plugins -- Claws Mail extra plugins meta package. DESCRIPTION
claws-mail-extra-plugins is a meta package for installing all extra plugins for the Claws Mail mailer. See below for the corresponding manpages of each installed plugin. SEE ALSO
claws-mail-acpi-notifier (1), claws-mail-attach-remover (1), claws-mail-cache-saver (1), claws-mail-etpan-privacy (1), claws-mail-feeds- reader (1), claws-mail-fetchinfo-plugin (1), claws-mail-html2-viewer (1), claws-mail-maildir-plugin (1), claws-mail-mailmbox-plugin (1), claws-mail-multi-notifier (1), claws-mail-newmail-plugin (1), claws-mail-perl-filter (1), claws-mail-smime-plugin (1), claws-mail-vcalen- dar-plugin (1), claws-mail-synce-plugin (1), claws-mail-attach-warner (1), claws-mail (1). http://www.claws-mail.org/plugins.php (link to URL http://www.claws-mail.org/plugins.php) AUTHOR
This manual page was written by Ricardo Mones mones@debian.org for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. CLAWS-MAIL-EXTRA-PLUGINS(1)
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