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Top Forums UNIX for Dummies Questions & Answers Find common numbers from two very large files using awk or the like Post 302799583 by RudiC on Friday 26th of April 2013 05:38:59 PM
Old 04-26-2013
grepping with a large pattern file is NOT very effective, but you could at least try the logics:
Code:
$ cut -c1-16 file1 > patternfile
$ grep -f patternfile file2


BTW - why should sdiff miss some matches? This is difficult to believe!

Last edited by RudiC; 04-26-2013 at 06:46 PM..
 

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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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