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Top Forums Shell Programming and Scripting Quick way to select many records from a large file Post 302942390 by rbatte1 on Tuesday 28th of April 2015 12:12:23 PM
Old 04-28-2015
If you can edit your key.txt and prefix each record with ^ and suffix each with $ then maybe you can use this with grep using the appropriate flags:-
Code:
grep -f key.txt records.txt

Does this help? There might be problems over the size of key.txt



Robin
 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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