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Top Forums Shell Programming and Scripting How to extract information a file according key id in another file? Post 302913542 by the_simpsons on Monday 18th of August 2014 10:56:26 AM
Old 08-18-2014
Hi, jim.
Thanks for your response. However, when i tried your code, the resultfile is exactly same as the bigfile.

There are about 4500 keys in the key file.
I haven't tried other methods because i'm really new to linux.


Quote:
Originally Posted by jim mcnamara
What have you tried?

How large is the key file?

A fast answer with a very slow way with a large key file:

Code:
grep -f keyfile bigfile  | cut -f 2- >> resultfile

 

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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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