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Top Forums UNIX for Dummies Questions & Answers Filter records in a huge text file from a filter text file Post 302919666 by Smiling Dragon on Friday 3rd of October 2014 01:07:24 AM
Old 10-03-2014
Code:
#!/bin/sh
while read line
do
  firstword=`echo "$line" | awk '{ print $1 }'`
  if egrep "^$firstword\$" filterfile.txt
  then
    echo "$line"
  fi
done

Depending on your OS, you might need to use grep, egrep, or grep -e.
This will be pretty slow if your filter list get's excessively long, but will scale well enough regardless of file size as it doesn't pull everything into memory.
This User Gave Thanks to Smiling Dragon For This Post:
 

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Net::LDAP::Filter(3pm)					User Contributed Perl Documentation				    Net::LDAP::Filter(3pm)

NAME
Net::LDAP::Filter - representation of LDAP filters SYNOPSIS
use Net::LDAP::Filter; $filter = Net::LDAP::Filter->new( $filter_str ); DESCRIPTION
The Net::LDAP::Filter object lets you directly manipulate LDAP filters without worrying about the string representation and all the associated escaping mechanisms. CONSTRUCTOR
new ( FILTER ) Create a new object and parse FILTER. METHODS
parse ( FILTER ) Parse FILTER. The next call to ber will return this filter encoded. as_string Return the filter in text form. print ( [ FH ] ) Print the text representation of the filter to FH, or the currently selected output handle if FH is not given. FILTER SYNTAX
Below is the syntax for a filter given in RFC-2254 http://www.ietf.org/rfc/rfc2254.txt filter = "(" filtercomp ")" filtercomp = and / or / not / item and = "&" filterlist or = "|" filterlist not = "!" filter filterlist = 1*filter item = simple / present / substring / extensible simple = attr filtertype value filtertype = equal / approx / greater / less equal = "=" approx = "~=" greater = ">=" less = "<=" extensible = attr [":dn"] [":" matchingrule] ":=" value / [":dn"] ":" matchingrule ":=" value present = attr "=*" substring = attr "=" [initial] any [final] initial = value any = "*" *(value "*") final = value attr = AttributeDescription from Section 4.1.5 of RFC-2251 matchingrule = MatchingRuleId from Section 4.1.9 of RFC-2251 value = AttributeValue from Section 4.1.6 of RFC-2251 Special Character encodings --------------------------- * 2a, * ( 28, ( ) 29, ) 5c, \ NUL 0 SEE ALSO
Net::LDAP, Other online documentation ACKNOWLEDGEMENTS
This document is based on a document originally written by Russell Fulton <r.fulton@auckland.ac.nz>. AUTHOR
Graham Barr <gbarr@pobox.com> Please report any bugs, or post any suggestions, to the perl-ldap mailing list <perl-ldap@perl.org>. COPYRIGHT
Copyright (c) 1997-2004 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-01-29 Net::LDAP::Filter(3pm)
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