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Full Discussion: [Solved] Find entries from one file in another
Top Forums UNIX for Dummies Questions & Answers [Solved] Find entries from one file in another Post 302797347 by bakunin on Monday 22nd of April 2013 12:08:29 PM
Old 04-22-2013
If you have a look at the man page of "grep" you will notice the "-f" option. Quote from the man-page:

Code:
-f FILE, --file=FILE
	      Obtain  patterns	from  FILE, one per line.  The empty file con-
	      tains zero patterns, and therefore matches nothing.

Therefore, supposing your keys are in file "keys.txt" and you want to search for these keys in "search.txt":

Code:
grep -f keys.txt search.txt

does exactly what you want.

Reading man pages is a very commendable activity. I do it many times day when working with Unix.

I hope this helps.

bakunin
 

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LEARN ABOUT X11R4

zgrep

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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