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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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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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