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Full Discussion: Bash Scipting (New); Run multiple greps > multiple files
Top Forums Shell Programming and Scripting Bash Scipting (New); Run multiple greps > multiple files Post 302748605 by neutronscott on Wednesday 26th of December 2012 10:33:17 AM
Old 12-26-2012
It'd take a lot of time to run 80 greps on every file. If you read in your word file into an array you can do it at once, depending on how many files and if you need to do subdirectories.

If not many words/files, you can try:

Code:
#!/bin/bash
wordfile=words.lst

# read in fixed strings from word file
while IFS= read -r line; do
        words+=('-e')
        words+=("$line")
done < "$wordfile"

echo grep -F "${words[@]}" -- dir1/*
mute@clt:~/temp/LDHB2012$ ./script
grep -F -e one -e string with spaces -e foo -e bar -- dir1/file1 dir1/file2 dir1/file3

remove the 'echo' and adjust as needed.

edit: oops. sorry. this doesn't meet the requirement of outputting to separate files. while I wasn't looking an awk solution was posted. That'd probably be best.
 

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LEARN ABOUT DEBIAN

data::random::wordlist

Data::Random::WordList(3pm)				User Contributed Perl Documentation			       Data::Random::WordList(3pm)

NAME

       Data::Random::WordList - Perl module to get random words from a word list

SYNOPSIS

	 use Data::Random::WordList;

	 my $wl = new Data::Random::WordList( wordlist => '/usr/share/dict/words' );

	 my @rand_words = $wl->get_words(10);

	 $wl->close();

DESCRIPTION

       Data::Random::WordList is a module that manages a file containing a list of words.

       The module expects each line of the word list file to contain only one word.  It could thus be easily used to select random lines from a
       file, but for coherency's sake, I'll keep referring to each line as a word.

       The module uses a persistent filehandle so that there isn't a lot of overhead every time you want to fetch a list of random words.
       However, it's much more efficient to grab multiple words at a time than it is to fetch one word at a time multiple times.

       The module also refrains from reading the whole file into memory, so it can be safer to use with larger files.

METHODS

   new()
       Returns a reference to a new Data::Random::WordList object.  Use the "wordlist" param to initialize the object:

       o   wordlist - the path to the wordlist file.  If a path isn't supplied, the wordlist distributed with this module is used.

   get_words([NUM])
       NUM contains the number of words you want from the wordlist.  NUM defaults to 1 if it's not specified.  get_words() dies if NUM is greater
       than the number of words in the wordlist.  This function returns an array or an array reference depending on the context in which it's
       called.

   close()
       Closes the filehandle associated with the word list.  It's good practice to do this every time you're done with the word list.

VERSION

       0.07

AUTHOR

       Originally written by: Adekunle Olonoh

       Currently maintained by: Buddy Burden (barefoot@cpan.org), starting with version 0.06

COPYRIGHT

       Copyright (c) 2000-2011 Adekunle Olonoh.  All rights reserved.  This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

SEE ALSO

       Data::Random

perl v5.14.2							    2012-06-04					       Data::Random::WordList(3pm)
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